00. Atomic Number, Mass Number, Atomic Species
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Structure of Atom

238610 The group having isoelectronic species is
#[Qdiff: Easy, QCat: Theory Based, examname: |---|---|, |
,
, {|c|c|c|}
, \mathrm{F}^{-}, (JEE Main-2017)
, | Species | ${l} { Atomic } |, | { number }$ | ${l} { Number of } |, | { electrons }$ |, |$^{2-}$ | 8 | 10 |, |$^{-}$ | 9 | 10 |, |$^{+}$ | 11 | 10 |, |$^{2+}$ | 12 | 10 |, |$^{-}$ | 8 | 9 |, |$$ | 11 | 11 |, |$^{+}$ | 12 | 11 |, Option (a) is correct which contains isoelectronic species $\mathrm{O}^{2-}, \mathrm{Na}^{+}, \mathrm{Mg}^{2+}$
, 75. Which one of the following sets of ions represents a collection of isoelectronic species?
,

1 $\mathrm{O}^{2-}, \mathrm{F}^{-}, \mathrm{Na}^{+}, \mathrm{Mg}^{2+}$
2 $\mathrm{O}^{-}, \mathrm{F}^{-}, \mathrm{Na}, \mathrm{Mg}^{+}$
3 $\mathrm{O}^{2-}, \mathrm{F}^{-}, \mathrm{Na}, \mathrm{Mg}^{2+}$
4 $\mathrm{O}^{-}, \mathrm{F}^{-}, \mathrm{Na}^{+}, \mathrm{Mg}^{2+}$
Structure of Atom

238618 Negatively charged particles are called
#[Qdiff: Easy, QCat: Theory Based, examname: |---|, Exp: } |, |
, {|c|c|c|}
, J and K CET-(2014)
, | { Ans. A
|, |Particles | Symbol | Relative charge |, |Electrons | $$ | -1 |, |Protons | $$ | +1 |, |Neutrons | $$ | 0 |, 85. Mass number of an atom is the sum of
,

1 Electrons
2 Protons
3 Neutrons
4 None of the above
Structure of Atom

238622 The specific heat of a metal is 0.11 and its equivalent weight is 18.61. Its exact atomic weight is

1 58.2
2 29.1
3 55.83
4 27.91
J and K CET-(1998)
Structure of Atom

238627 An element with mass number 81 contains $31.7 \%$ more neutrons as compared to protons. It symbol is

1 ${ }_{40} \mathrm{X}^{81}$
2 ${ }_{35} \mathrm{X}^{81}$
3 ${ }_{81} \mathrm{X}^{317}$
4 ${ }_{40} \mathrm{X}^{81}$
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Structure of Atom

238610 The group having isoelectronic species is
#[Qdiff: Easy, QCat: Theory Based, examname: |---|---|, |
,
, {|c|c|c|}
, \mathrm{F}^{-}, (JEE Main-2017)
, | Species | ${l} { Atomic } |, | { number }$ | ${l} { Number of } |, | { electrons }$ |, |$^{2-}$ | 8 | 10 |, |$^{-}$ | 9 | 10 |, |$^{+}$ | 11 | 10 |, |$^{2+}$ | 12 | 10 |, |$^{-}$ | 8 | 9 |, |$$ | 11 | 11 |, |$^{+}$ | 12 | 11 |, Option (a) is correct which contains isoelectronic species $\mathrm{O}^{2-}, \mathrm{Na}^{+}, \mathrm{Mg}^{2+}$
, 75. Which one of the following sets of ions represents a collection of isoelectronic species?
,

1 $\mathrm{O}^{2-}, \mathrm{F}^{-}, \mathrm{Na}^{+}, \mathrm{Mg}^{2+}$
2 $\mathrm{O}^{-}, \mathrm{F}^{-}, \mathrm{Na}, \mathrm{Mg}^{+}$
3 $\mathrm{O}^{2-}, \mathrm{F}^{-}, \mathrm{Na}, \mathrm{Mg}^{2+}$
4 $\mathrm{O}^{-}, \mathrm{F}^{-}, \mathrm{Na}^{+}, \mathrm{Mg}^{2+}$
Structure of Atom

238618 Negatively charged particles are called
#[Qdiff: Easy, QCat: Theory Based, examname: |---|, Exp: } |, |
, {|c|c|c|}
, J and K CET-(2014)
, | { Ans. A
|, |Particles | Symbol | Relative charge |, |Electrons | $$ | -1 |, |Protons | $$ | +1 |, |Neutrons | $$ | 0 |, 85. Mass number of an atom is the sum of
,

1 Electrons
2 Protons
3 Neutrons
4 None of the above
Structure of Atom

238622 The specific heat of a metal is 0.11 and its equivalent weight is 18.61. Its exact atomic weight is

1 58.2
2 29.1
3 55.83
4 27.91
J and K CET-(1998)
Structure of Atom

238627 An element with mass number 81 contains $31.7 \%$ more neutrons as compared to protons. It symbol is

1 ${ }_{40} \mathrm{X}^{81}$
2 ${ }_{35} \mathrm{X}^{81}$
3 ${ }_{81} \mathrm{X}^{317}$
4 ${ }_{40} \mathrm{X}^{81}$
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Structure of Atom

238610 The group having isoelectronic species is
#[Qdiff: Easy, QCat: Theory Based, examname: |---|---|, |
,
, {|c|c|c|}
, \mathrm{F}^{-}, (JEE Main-2017)
, | Species | ${l} { Atomic } |, | { number }$ | ${l} { Number of } |, | { electrons }$ |, |$^{2-}$ | 8 | 10 |, |$^{-}$ | 9 | 10 |, |$^{+}$ | 11 | 10 |, |$^{2+}$ | 12 | 10 |, |$^{-}$ | 8 | 9 |, |$$ | 11 | 11 |, |$^{+}$ | 12 | 11 |, Option (a) is correct which contains isoelectronic species $\mathrm{O}^{2-}, \mathrm{Na}^{+}, \mathrm{Mg}^{2+}$
, 75. Which one of the following sets of ions represents a collection of isoelectronic species?
,

1 $\mathrm{O}^{2-}, \mathrm{F}^{-}, \mathrm{Na}^{+}, \mathrm{Mg}^{2+}$
2 $\mathrm{O}^{-}, \mathrm{F}^{-}, \mathrm{Na}, \mathrm{Mg}^{+}$
3 $\mathrm{O}^{2-}, \mathrm{F}^{-}, \mathrm{Na}, \mathrm{Mg}^{2+}$
4 $\mathrm{O}^{-}, \mathrm{F}^{-}, \mathrm{Na}^{+}, \mathrm{Mg}^{2+}$
Structure of Atom

238618 Negatively charged particles are called
#[Qdiff: Easy, QCat: Theory Based, examname: |---|, Exp: } |, |
, {|c|c|c|}
, J and K CET-(2014)
, | { Ans. A
|, |Particles | Symbol | Relative charge |, |Electrons | $$ | -1 |, |Protons | $$ | +1 |, |Neutrons | $$ | 0 |, 85. Mass number of an atom is the sum of
,

1 Electrons
2 Protons
3 Neutrons
4 None of the above
Structure of Atom

238622 The specific heat of a metal is 0.11 and its equivalent weight is 18.61. Its exact atomic weight is

1 58.2
2 29.1
3 55.83
4 27.91
J and K CET-(1998)
Structure of Atom

238627 An element with mass number 81 contains $31.7 \%$ more neutrons as compared to protons. It symbol is

1 ${ }_{40} \mathrm{X}^{81}$
2 ${ }_{35} \mathrm{X}^{81}$
3 ${ }_{81} \mathrm{X}^{317}$
4 ${ }_{40} \mathrm{X}^{81}$
JIPMER-2019
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Structure of Atom

238610 The group having isoelectronic species is
#[Qdiff: Easy, QCat: Theory Based, examname: |---|---|, |
,
, {|c|c|c|}
, \mathrm{F}^{-}, (JEE Main-2017)
, | Species | ${l} { Atomic } |, | { number }$ | ${l} { Number of } |, | { electrons }$ |, |$^{2-}$ | 8 | 10 |, |$^{-}$ | 9 | 10 |, |$^{+}$ | 11 | 10 |, |$^{2+}$ | 12 | 10 |, |$^{-}$ | 8 | 9 |, |$$ | 11 | 11 |, |$^{+}$ | 12 | 11 |, Option (a) is correct which contains isoelectronic species $\mathrm{O}^{2-}, \mathrm{Na}^{+}, \mathrm{Mg}^{2+}$
, 75. Which one of the following sets of ions represents a collection of isoelectronic species?
,

1 $\mathrm{O}^{2-}, \mathrm{F}^{-}, \mathrm{Na}^{+}, \mathrm{Mg}^{2+}$
2 $\mathrm{O}^{-}, \mathrm{F}^{-}, \mathrm{Na}, \mathrm{Mg}^{+}$
3 $\mathrm{O}^{2-}, \mathrm{F}^{-}, \mathrm{Na}, \mathrm{Mg}^{2+}$
4 $\mathrm{O}^{-}, \mathrm{F}^{-}, \mathrm{Na}^{+}, \mathrm{Mg}^{2+}$
Structure of Atom

238618 Negatively charged particles are called
#[Qdiff: Easy, QCat: Theory Based, examname: |---|, Exp: } |, |
, {|c|c|c|}
, J and K CET-(2014)
, | { Ans. A
|, |Particles | Symbol | Relative charge |, |Electrons | $$ | -1 |, |Protons | $$ | +1 |, |Neutrons | $$ | 0 |, 85. Mass number of an atom is the sum of
,

1 Electrons
2 Protons
3 Neutrons
4 None of the above
Structure of Atom

238622 The specific heat of a metal is 0.11 and its equivalent weight is 18.61. Its exact atomic weight is

1 58.2
2 29.1
3 55.83
4 27.91
J and K CET-(1998)
Structure of Atom

238627 An element with mass number 81 contains $31.7 \%$ more neutrons as compared to protons. It symbol is

1 ${ }_{40} \mathrm{X}^{81}$
2 ${ }_{35} \mathrm{X}^{81}$
3 ${ }_{81} \mathrm{X}^{317}$
4 ${ }_{40} \mathrm{X}^{81}$
JIPMER-2019
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