Classification of Elements and Periodicity in Properties
89393
In the periodic table metallic character of elements shows one of the following trend:
1 Decreases down the group and increases across the period
2 Increases down the group and decreases across the period
3 Increases across the period and also down the group
4 Decreases across the period and also down the group
Explanation:
The effective nuclear charge acting on the valence shell electrons increases across a period, the tendency to lose electrons will decreases. Down the group, the effective nuclear charge experienced by valence electrons decrease because the outer most electrons move further away from the nucleus. Therefore, these can be lost easily. Hence, metallic character decreases across a period and increase down a group.
JCECE - 2005
Classification of Elements and Periodicity in Properties
89394
Which of the following is correct?
1 The number of electrons present in the valence shell of $\mathrm{S}$ in $\mathrm{SF}_6$ is 12
2 The rates of ionic reactions are very slow
3 According to VSEPR theory, $\mathrm{SnCl}_2$ is a linear molecule
4 The correct order of ability to form ionic compounds among $\mathrm{Na}^{+}, \mathrm{Mg}^{2+}$ and $\mathrm{Al}^{3+}$ is $\mathrm{Al}^{3+}>\mathrm{Mg}^{2+}>\mathrm{Na}^{+}$
Explanation:
- The number of electrons present in the valence shell of $\mathrm{S}$ in $\mathrm{SF}_6$ is 12 . Statement is true. - The rates of ionic reactions are very fast. Statement is false. - According, to VSEPR theory, $\mathrm{SnCl}_2$ is a bent or $\mathrm{V}$ shaped molecule. Statement is false. - The correct order of ability to form ionic compounds among $\mathrm{Na}^{+}, \mathrm{Mg}^{2+}$ and $\mathrm{Al}^{3+}$ is $\mathrm{Na}^{+}>$ $\mathrm{Mg}^{2+}>\mathrm{Al}^{3+}$. Statement is false.
AP-EAMCET/2005
Classification of Elements and Periodicity in Properties
89342
The plot of square root of frequency of $X$-ray emitted against atomic number led to suggestion of which law/rule?
1 Periodic law
2 Modern periodic law
3 Hund's rule
4 Newland's law
Explanation:
Moseley gave the modern periodic law. He showed the atomic number is more fundamental property of an element than its atomic mass. The square root of the frequency of a line (x-ray spectrum) is related to the atomic number $Z$. $$ \sqrt{v}=\mathrm{a}(\mathrm{z}-\mathrm{b}) $$ Where, $Z=$ Atomic number $\mathrm{a}=$ Proportionality constant $\mathrm{b}=$ Another constant
MHT CET-2014
Classification of Elements and Periodicity in Properties
89344
Which one of the following has incomplete octet?
1 $\mathrm{NH}_3$
2 $\mathrm{BCl}_3$
3 $\mathrm{CCl}_4$
4 $\mathrm{PCl}_3$
Explanation:
${ }_5 \mathrm{~B}=2,3$ In $\mathrm{BCl}_3$, $\mathrm{B}$ has 6 electrons. Therefore, it has incomplete octet.
UP CPMT-2012
Classification of Elements and Periodicity in Properties
89346
Which of the following is a wrong statement? In a given period of the Periodic Table, the sblock element has, in general, a higher value of
1 electronegativity
2 atomic radius
3 ionisation energy
4 electron affinity
Explanation:
Atomic radius decrease along the period so, sblock element will have high atomic radius. - Electron affinity increases along the period so, sblock element will have less electron affinity. - Electronegativity increases along the period so, sblock element will have less electro-negativity. - Ionization energy increase along the period so, sblock element will have less Ionization energy.
Classification of Elements and Periodicity in Properties
89393
In the periodic table metallic character of elements shows one of the following trend:
1 Decreases down the group and increases across the period
2 Increases down the group and decreases across the period
3 Increases across the period and also down the group
4 Decreases across the period and also down the group
Explanation:
The effective nuclear charge acting on the valence shell electrons increases across a period, the tendency to lose electrons will decreases. Down the group, the effective nuclear charge experienced by valence electrons decrease because the outer most electrons move further away from the nucleus. Therefore, these can be lost easily. Hence, metallic character decreases across a period and increase down a group.
JCECE - 2005
Classification of Elements and Periodicity in Properties
89394
Which of the following is correct?
1 The number of electrons present in the valence shell of $\mathrm{S}$ in $\mathrm{SF}_6$ is 12
2 The rates of ionic reactions are very slow
3 According to VSEPR theory, $\mathrm{SnCl}_2$ is a linear molecule
4 The correct order of ability to form ionic compounds among $\mathrm{Na}^{+}, \mathrm{Mg}^{2+}$ and $\mathrm{Al}^{3+}$ is $\mathrm{Al}^{3+}>\mathrm{Mg}^{2+}>\mathrm{Na}^{+}$
Explanation:
- The number of electrons present in the valence shell of $\mathrm{S}$ in $\mathrm{SF}_6$ is 12 . Statement is true. - The rates of ionic reactions are very fast. Statement is false. - According, to VSEPR theory, $\mathrm{SnCl}_2$ is a bent or $\mathrm{V}$ shaped molecule. Statement is false. - The correct order of ability to form ionic compounds among $\mathrm{Na}^{+}, \mathrm{Mg}^{2+}$ and $\mathrm{Al}^{3+}$ is $\mathrm{Na}^{+}>$ $\mathrm{Mg}^{2+}>\mathrm{Al}^{3+}$. Statement is false.
AP-EAMCET/2005
Classification of Elements and Periodicity in Properties
89342
The plot of square root of frequency of $X$-ray emitted against atomic number led to suggestion of which law/rule?
1 Periodic law
2 Modern periodic law
3 Hund's rule
4 Newland's law
Explanation:
Moseley gave the modern periodic law. He showed the atomic number is more fundamental property of an element than its atomic mass. The square root of the frequency of a line (x-ray spectrum) is related to the atomic number $Z$. $$ \sqrt{v}=\mathrm{a}(\mathrm{z}-\mathrm{b}) $$ Where, $Z=$ Atomic number $\mathrm{a}=$ Proportionality constant $\mathrm{b}=$ Another constant
MHT CET-2014
Classification of Elements and Periodicity in Properties
89344
Which one of the following has incomplete octet?
1 $\mathrm{NH}_3$
2 $\mathrm{BCl}_3$
3 $\mathrm{CCl}_4$
4 $\mathrm{PCl}_3$
Explanation:
${ }_5 \mathrm{~B}=2,3$ In $\mathrm{BCl}_3$, $\mathrm{B}$ has 6 electrons. Therefore, it has incomplete octet.
UP CPMT-2012
Classification of Elements and Periodicity in Properties
89346
Which of the following is a wrong statement? In a given period of the Periodic Table, the sblock element has, in general, a higher value of
1 electronegativity
2 atomic radius
3 ionisation energy
4 electron affinity
Explanation:
Atomic radius decrease along the period so, sblock element will have high atomic radius. - Electron affinity increases along the period so, sblock element will have less electron affinity. - Electronegativity increases along the period so, sblock element will have less electro-negativity. - Ionization energy increase along the period so, sblock element will have less Ionization energy.
Classification of Elements and Periodicity in Properties
89393
In the periodic table metallic character of elements shows one of the following trend:
1 Decreases down the group and increases across the period
2 Increases down the group and decreases across the period
3 Increases across the period and also down the group
4 Decreases across the period and also down the group
Explanation:
The effective nuclear charge acting on the valence shell electrons increases across a period, the tendency to lose electrons will decreases. Down the group, the effective nuclear charge experienced by valence electrons decrease because the outer most electrons move further away from the nucleus. Therefore, these can be lost easily. Hence, metallic character decreases across a period and increase down a group.
JCECE - 2005
Classification of Elements and Periodicity in Properties
89394
Which of the following is correct?
1 The number of electrons present in the valence shell of $\mathrm{S}$ in $\mathrm{SF}_6$ is 12
2 The rates of ionic reactions are very slow
3 According to VSEPR theory, $\mathrm{SnCl}_2$ is a linear molecule
4 The correct order of ability to form ionic compounds among $\mathrm{Na}^{+}, \mathrm{Mg}^{2+}$ and $\mathrm{Al}^{3+}$ is $\mathrm{Al}^{3+}>\mathrm{Mg}^{2+}>\mathrm{Na}^{+}$
Explanation:
- The number of electrons present in the valence shell of $\mathrm{S}$ in $\mathrm{SF}_6$ is 12 . Statement is true. - The rates of ionic reactions are very fast. Statement is false. - According, to VSEPR theory, $\mathrm{SnCl}_2$ is a bent or $\mathrm{V}$ shaped molecule. Statement is false. - The correct order of ability to form ionic compounds among $\mathrm{Na}^{+}, \mathrm{Mg}^{2+}$ and $\mathrm{Al}^{3+}$ is $\mathrm{Na}^{+}>$ $\mathrm{Mg}^{2+}>\mathrm{Al}^{3+}$. Statement is false.
AP-EAMCET/2005
Classification of Elements and Periodicity in Properties
89342
The plot of square root of frequency of $X$-ray emitted against atomic number led to suggestion of which law/rule?
1 Periodic law
2 Modern periodic law
3 Hund's rule
4 Newland's law
Explanation:
Moseley gave the modern periodic law. He showed the atomic number is more fundamental property of an element than its atomic mass. The square root of the frequency of a line (x-ray spectrum) is related to the atomic number $Z$. $$ \sqrt{v}=\mathrm{a}(\mathrm{z}-\mathrm{b}) $$ Where, $Z=$ Atomic number $\mathrm{a}=$ Proportionality constant $\mathrm{b}=$ Another constant
MHT CET-2014
Classification of Elements and Periodicity in Properties
89344
Which one of the following has incomplete octet?
1 $\mathrm{NH}_3$
2 $\mathrm{BCl}_3$
3 $\mathrm{CCl}_4$
4 $\mathrm{PCl}_3$
Explanation:
${ }_5 \mathrm{~B}=2,3$ In $\mathrm{BCl}_3$, $\mathrm{B}$ has 6 electrons. Therefore, it has incomplete octet.
UP CPMT-2012
Classification of Elements and Periodicity in Properties
89346
Which of the following is a wrong statement? In a given period of the Periodic Table, the sblock element has, in general, a higher value of
1 electronegativity
2 atomic radius
3 ionisation energy
4 electron affinity
Explanation:
Atomic radius decrease along the period so, sblock element will have high atomic radius. - Electron affinity increases along the period so, sblock element will have less electron affinity. - Electronegativity increases along the period so, sblock element will have less electro-negativity. - Ionization energy increase along the period so, sblock element will have less Ionization energy.
Classification of Elements and Periodicity in Properties
89393
In the periodic table metallic character of elements shows one of the following trend:
1 Decreases down the group and increases across the period
2 Increases down the group and decreases across the period
3 Increases across the period and also down the group
4 Decreases across the period and also down the group
Explanation:
The effective nuclear charge acting on the valence shell electrons increases across a period, the tendency to lose electrons will decreases. Down the group, the effective nuclear charge experienced by valence electrons decrease because the outer most electrons move further away from the nucleus. Therefore, these can be lost easily. Hence, metallic character decreases across a period and increase down a group.
JCECE - 2005
Classification of Elements and Periodicity in Properties
89394
Which of the following is correct?
1 The number of electrons present in the valence shell of $\mathrm{S}$ in $\mathrm{SF}_6$ is 12
2 The rates of ionic reactions are very slow
3 According to VSEPR theory, $\mathrm{SnCl}_2$ is a linear molecule
4 The correct order of ability to form ionic compounds among $\mathrm{Na}^{+}, \mathrm{Mg}^{2+}$ and $\mathrm{Al}^{3+}$ is $\mathrm{Al}^{3+}>\mathrm{Mg}^{2+}>\mathrm{Na}^{+}$
Explanation:
- The number of electrons present in the valence shell of $\mathrm{S}$ in $\mathrm{SF}_6$ is 12 . Statement is true. - The rates of ionic reactions are very fast. Statement is false. - According, to VSEPR theory, $\mathrm{SnCl}_2$ is a bent or $\mathrm{V}$ shaped molecule. Statement is false. - The correct order of ability to form ionic compounds among $\mathrm{Na}^{+}, \mathrm{Mg}^{2+}$ and $\mathrm{Al}^{3+}$ is $\mathrm{Na}^{+}>$ $\mathrm{Mg}^{2+}>\mathrm{Al}^{3+}$. Statement is false.
AP-EAMCET/2005
Classification of Elements and Periodicity in Properties
89342
The plot of square root of frequency of $X$-ray emitted against atomic number led to suggestion of which law/rule?
1 Periodic law
2 Modern periodic law
3 Hund's rule
4 Newland's law
Explanation:
Moseley gave the modern periodic law. He showed the atomic number is more fundamental property of an element than its atomic mass. The square root of the frequency of a line (x-ray spectrum) is related to the atomic number $Z$. $$ \sqrt{v}=\mathrm{a}(\mathrm{z}-\mathrm{b}) $$ Where, $Z=$ Atomic number $\mathrm{a}=$ Proportionality constant $\mathrm{b}=$ Another constant
MHT CET-2014
Classification of Elements and Periodicity in Properties
89344
Which one of the following has incomplete octet?
1 $\mathrm{NH}_3$
2 $\mathrm{BCl}_3$
3 $\mathrm{CCl}_4$
4 $\mathrm{PCl}_3$
Explanation:
${ }_5 \mathrm{~B}=2,3$ In $\mathrm{BCl}_3$, $\mathrm{B}$ has 6 electrons. Therefore, it has incomplete octet.
UP CPMT-2012
Classification of Elements and Periodicity in Properties
89346
Which of the following is a wrong statement? In a given period of the Periodic Table, the sblock element has, in general, a higher value of
1 electronegativity
2 atomic radius
3 ionisation energy
4 electron affinity
Explanation:
Atomic radius decrease along the period so, sblock element will have high atomic radius. - Electron affinity increases along the period so, sblock element will have less electron affinity. - Electronegativity increases along the period so, sblock element will have less electro-negativity. - Ionization energy increase along the period so, sblock element will have less Ionization energy.
Classification of Elements and Periodicity in Properties
89393
In the periodic table metallic character of elements shows one of the following trend:
1 Decreases down the group and increases across the period
2 Increases down the group and decreases across the period
3 Increases across the period and also down the group
4 Decreases across the period and also down the group
Explanation:
The effective nuclear charge acting on the valence shell electrons increases across a period, the tendency to lose electrons will decreases. Down the group, the effective nuclear charge experienced by valence electrons decrease because the outer most electrons move further away from the nucleus. Therefore, these can be lost easily. Hence, metallic character decreases across a period and increase down a group.
JCECE - 2005
Classification of Elements and Periodicity in Properties
89394
Which of the following is correct?
1 The number of electrons present in the valence shell of $\mathrm{S}$ in $\mathrm{SF}_6$ is 12
2 The rates of ionic reactions are very slow
3 According to VSEPR theory, $\mathrm{SnCl}_2$ is a linear molecule
4 The correct order of ability to form ionic compounds among $\mathrm{Na}^{+}, \mathrm{Mg}^{2+}$ and $\mathrm{Al}^{3+}$ is $\mathrm{Al}^{3+}>\mathrm{Mg}^{2+}>\mathrm{Na}^{+}$
Explanation:
- The number of electrons present in the valence shell of $\mathrm{S}$ in $\mathrm{SF}_6$ is 12 . Statement is true. - The rates of ionic reactions are very fast. Statement is false. - According, to VSEPR theory, $\mathrm{SnCl}_2$ is a bent or $\mathrm{V}$ shaped molecule. Statement is false. - The correct order of ability to form ionic compounds among $\mathrm{Na}^{+}, \mathrm{Mg}^{2+}$ and $\mathrm{Al}^{3+}$ is $\mathrm{Na}^{+}>$ $\mathrm{Mg}^{2+}>\mathrm{Al}^{3+}$. Statement is false.
AP-EAMCET/2005
Classification of Elements and Periodicity in Properties
89342
The plot of square root of frequency of $X$-ray emitted against atomic number led to suggestion of which law/rule?
1 Periodic law
2 Modern periodic law
3 Hund's rule
4 Newland's law
Explanation:
Moseley gave the modern periodic law. He showed the atomic number is more fundamental property of an element than its atomic mass. The square root of the frequency of a line (x-ray spectrum) is related to the atomic number $Z$. $$ \sqrt{v}=\mathrm{a}(\mathrm{z}-\mathrm{b}) $$ Where, $Z=$ Atomic number $\mathrm{a}=$ Proportionality constant $\mathrm{b}=$ Another constant
MHT CET-2014
Classification of Elements and Periodicity in Properties
89344
Which one of the following has incomplete octet?
1 $\mathrm{NH}_3$
2 $\mathrm{BCl}_3$
3 $\mathrm{CCl}_4$
4 $\mathrm{PCl}_3$
Explanation:
${ }_5 \mathrm{~B}=2,3$ In $\mathrm{BCl}_3$, $\mathrm{B}$ has 6 electrons. Therefore, it has incomplete octet.
UP CPMT-2012
Classification of Elements and Periodicity in Properties
89346
Which of the following is a wrong statement? In a given period of the Periodic Table, the sblock element has, in general, a higher value of
1 electronegativity
2 atomic radius
3 ionisation energy
4 electron affinity
Explanation:
Atomic radius decrease along the period so, sblock element will have high atomic radius. - Electron affinity increases along the period so, sblock element will have less electron affinity. - Electronegativity increases along the period so, sblock element will have less electro-negativity. - Ionization energy increase along the period so, sblock element will have less Ionization energy.
