These are transition metals with the $1) \mathrm{d}^{1-10}$ ns $^{-2}$ configuration. The atomic and ionic radii of transition elements in a given series show a decreasing trend for first five elements and then becomes almost constant for next five elements.
JCECE - 2014
Classification of Elements and Periodicity in Properties
89465
Atomic number of $\mathrm{Na}=11 ; \mathrm{Mg}=12 ; \mathrm{Al}=13$. Among $\mathrm{Na}^{+}$, Na, $\mathrm{Mg}, \mathrm{Mg}^{2+}$ and $\mathrm{Al}^{3+}$, the smallest and the biggest are respectively
1 $\mathrm{Na} ; \mathrm{Na}^{+}$
2 $\mathrm{Mg}^{2+} ; \mathrm{Na}$
3 $\mathrm{Na}^{+} ; \mathrm{Mg}^{2+}$
4 $\mathrm{Al}^{3+} ; \mathrm{Na}$
Explanation:
Number of positive charge on element increases, size decreases. Hence the order of increasing size $\mathrm{Al}^{+3}<\mathrm{Mg}^{2+}<\mathrm{Na}^{+}<\mathrm{Na}$ Smallest size $\mathrm{Al}^{+3}$ and biggest size $\mathrm{Na}$.
SRMJEEE - 2013
Classification of Elements and Periodicity in Properties
89466
The correct order of atomic radius of $\mathrm{Li}, \mathrm{Be}$ and $B$ is
1 $\mathrm{B}>\mathrm{Be}>\mathrm{Li}$
2 B $>\mathrm{Li}>\mathrm{Be}$
3 Li $>$ B $>$ Be
4 $\mathrm{Li}>\mathrm{Be}>\mathrm{B}$
Explanation:
In the period, when we move left to right then the size of atomic radius decreases and there is the one electron add in the same shell due to this enhanced nuclear charge. The electrons of all the shells are pulled little closer to the nucleous thereby making each individual shell smaller and smaller. Thus, the correct decreasing order of atomic radius is: $\mathrm{Li}>\mathrm{Be}>\mathrm{B}$.
AP EAMCET (Medical) - 2013
Classification of Elements and Periodicity in Properties
89468
Consider the following ions: 1. $\mathrm{Na}^{+}$ 2. $\mathrm{Al}^{3+}$ 3. $\mathrm{Si}^{4+}$ In naturally occurring zeolites which of the above ions are present?
1 1 and 2 only
2 1 and 3 only
3 2 and 3 only
4 1,2 and 3
Explanation:
Natural zeolites are non-porus, amorphous and durable. $\mathrm{Na}^{+}, \mathrm{Al}^{3+}$, and $\mathrm{Si}^{4+}$ are some of the naturally occurring zeolites.
These are transition metals with the $1) \mathrm{d}^{1-10}$ ns $^{-2}$ configuration. The atomic and ionic radii of transition elements in a given series show a decreasing trend for first five elements and then becomes almost constant for next five elements.
JCECE - 2014
Classification of Elements and Periodicity in Properties
89465
Atomic number of $\mathrm{Na}=11 ; \mathrm{Mg}=12 ; \mathrm{Al}=13$. Among $\mathrm{Na}^{+}$, Na, $\mathrm{Mg}, \mathrm{Mg}^{2+}$ and $\mathrm{Al}^{3+}$, the smallest and the biggest are respectively
1 $\mathrm{Na} ; \mathrm{Na}^{+}$
2 $\mathrm{Mg}^{2+} ; \mathrm{Na}$
3 $\mathrm{Na}^{+} ; \mathrm{Mg}^{2+}$
4 $\mathrm{Al}^{3+} ; \mathrm{Na}$
Explanation:
Number of positive charge on element increases, size decreases. Hence the order of increasing size $\mathrm{Al}^{+3}<\mathrm{Mg}^{2+}<\mathrm{Na}^{+}<\mathrm{Na}$ Smallest size $\mathrm{Al}^{+3}$ and biggest size $\mathrm{Na}$.
SRMJEEE - 2013
Classification of Elements and Periodicity in Properties
89466
The correct order of atomic radius of $\mathrm{Li}, \mathrm{Be}$ and $B$ is
1 $\mathrm{B}>\mathrm{Be}>\mathrm{Li}$
2 B $>\mathrm{Li}>\mathrm{Be}$
3 Li $>$ B $>$ Be
4 $\mathrm{Li}>\mathrm{Be}>\mathrm{B}$
Explanation:
In the period, when we move left to right then the size of atomic radius decreases and there is the one electron add in the same shell due to this enhanced nuclear charge. The electrons of all the shells are pulled little closer to the nucleous thereby making each individual shell smaller and smaller. Thus, the correct decreasing order of atomic radius is: $\mathrm{Li}>\mathrm{Be}>\mathrm{B}$.
AP EAMCET (Medical) - 2013
Classification of Elements and Periodicity in Properties
89468
Consider the following ions: 1. $\mathrm{Na}^{+}$ 2. $\mathrm{Al}^{3+}$ 3. $\mathrm{Si}^{4+}$ In naturally occurring zeolites which of the above ions are present?
1 1 and 2 only
2 1 and 3 only
3 2 and 3 only
4 1,2 and 3
Explanation:
Natural zeolites are non-porus, amorphous and durable. $\mathrm{Na}^{+}, \mathrm{Al}^{3+}$, and $\mathrm{Si}^{4+}$ are some of the naturally occurring zeolites.
These are transition metals with the $1) \mathrm{d}^{1-10}$ ns $^{-2}$ configuration. The atomic and ionic radii of transition elements in a given series show a decreasing trend for first five elements and then becomes almost constant for next five elements.
JCECE - 2014
Classification of Elements and Periodicity in Properties
89465
Atomic number of $\mathrm{Na}=11 ; \mathrm{Mg}=12 ; \mathrm{Al}=13$. Among $\mathrm{Na}^{+}$, Na, $\mathrm{Mg}, \mathrm{Mg}^{2+}$ and $\mathrm{Al}^{3+}$, the smallest and the biggest are respectively
1 $\mathrm{Na} ; \mathrm{Na}^{+}$
2 $\mathrm{Mg}^{2+} ; \mathrm{Na}$
3 $\mathrm{Na}^{+} ; \mathrm{Mg}^{2+}$
4 $\mathrm{Al}^{3+} ; \mathrm{Na}$
Explanation:
Number of positive charge on element increases, size decreases. Hence the order of increasing size $\mathrm{Al}^{+3}<\mathrm{Mg}^{2+}<\mathrm{Na}^{+}<\mathrm{Na}$ Smallest size $\mathrm{Al}^{+3}$ and biggest size $\mathrm{Na}$.
SRMJEEE - 2013
Classification of Elements and Periodicity in Properties
89466
The correct order of atomic radius of $\mathrm{Li}, \mathrm{Be}$ and $B$ is
1 $\mathrm{B}>\mathrm{Be}>\mathrm{Li}$
2 B $>\mathrm{Li}>\mathrm{Be}$
3 Li $>$ B $>$ Be
4 $\mathrm{Li}>\mathrm{Be}>\mathrm{B}$
Explanation:
In the period, when we move left to right then the size of atomic radius decreases and there is the one electron add in the same shell due to this enhanced nuclear charge. The electrons of all the shells are pulled little closer to the nucleous thereby making each individual shell smaller and smaller. Thus, the correct decreasing order of atomic radius is: $\mathrm{Li}>\mathrm{Be}>\mathrm{B}$.
AP EAMCET (Medical) - 2013
Classification of Elements and Periodicity in Properties
89468
Consider the following ions: 1. $\mathrm{Na}^{+}$ 2. $\mathrm{Al}^{3+}$ 3. $\mathrm{Si}^{4+}$ In naturally occurring zeolites which of the above ions are present?
1 1 and 2 only
2 1 and 3 only
3 2 and 3 only
4 1,2 and 3
Explanation:
Natural zeolites are non-porus, amorphous and durable. $\mathrm{Na}^{+}, \mathrm{Al}^{3+}$, and $\mathrm{Si}^{4+}$ are some of the naturally occurring zeolites.
These are transition metals with the $1) \mathrm{d}^{1-10}$ ns $^{-2}$ configuration. The atomic and ionic radii of transition elements in a given series show a decreasing trend for first five elements and then becomes almost constant for next five elements.
JCECE - 2014
Classification of Elements and Periodicity in Properties
89465
Atomic number of $\mathrm{Na}=11 ; \mathrm{Mg}=12 ; \mathrm{Al}=13$. Among $\mathrm{Na}^{+}$, Na, $\mathrm{Mg}, \mathrm{Mg}^{2+}$ and $\mathrm{Al}^{3+}$, the smallest and the biggest are respectively
1 $\mathrm{Na} ; \mathrm{Na}^{+}$
2 $\mathrm{Mg}^{2+} ; \mathrm{Na}$
3 $\mathrm{Na}^{+} ; \mathrm{Mg}^{2+}$
4 $\mathrm{Al}^{3+} ; \mathrm{Na}$
Explanation:
Number of positive charge on element increases, size decreases. Hence the order of increasing size $\mathrm{Al}^{+3}<\mathrm{Mg}^{2+}<\mathrm{Na}^{+}<\mathrm{Na}$ Smallest size $\mathrm{Al}^{+3}$ and biggest size $\mathrm{Na}$.
SRMJEEE - 2013
Classification of Elements and Periodicity in Properties
89466
The correct order of atomic radius of $\mathrm{Li}, \mathrm{Be}$ and $B$ is
1 $\mathrm{B}>\mathrm{Be}>\mathrm{Li}$
2 B $>\mathrm{Li}>\mathrm{Be}$
3 Li $>$ B $>$ Be
4 $\mathrm{Li}>\mathrm{Be}>\mathrm{B}$
Explanation:
In the period, when we move left to right then the size of atomic radius decreases and there is the one electron add in the same shell due to this enhanced nuclear charge. The electrons of all the shells are pulled little closer to the nucleous thereby making each individual shell smaller and smaller. Thus, the correct decreasing order of atomic radius is: $\mathrm{Li}>\mathrm{Be}>\mathrm{B}$.
AP EAMCET (Medical) - 2013
Classification of Elements and Periodicity in Properties
89468
Consider the following ions: 1. $\mathrm{Na}^{+}$ 2. $\mathrm{Al}^{3+}$ 3. $\mathrm{Si}^{4+}$ In naturally occurring zeolites which of the above ions are present?
1 1 and 2 only
2 1 and 3 only
3 2 and 3 only
4 1,2 and 3
Explanation:
Natural zeolites are non-porus, amorphous and durable. $\mathrm{Na}^{+}, \mathrm{Al}^{3+}$, and $\mathrm{Si}^{4+}$ are some of the naturally occurring zeolites.