In general, the atomic and ionic radii increases on moving down in a group. But the element of second transition series (eg.,Zr, Nb, Mo etc.,) have the almost same radii as the elements of third transition series (eg. Hf, Ta, W etc.). This is because of lanthanide contraction.
CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES
313254
Which ion has the largest radius?
1 \(\mathrm{Se}^{2-}\)
2 \(\mathrm{F}^{-}\)
3 \(\mathrm{O}^{2-}\)
4 \(\mathrm{Rb}^{+}\)
Explanation:
On moving down the group, atomic radius increases, while it decreases on moving from left to right. However, for isoelectronic species, the atomic radius decreases with increase in atomic number. Further, larger the charge on the anion, greater is the radius. Hence, on considering all the factors, \(\mathrm{Se}^{2-}\) would possesses largest ionic radius among the given options.
CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES
313255
Assertion : The negative ion is always larger in size than its atom. Reason : As the number of electrons increases, the nuclear charge per electron is reduced.
1 If both Assertion & Reason are true and the reason is the correct explanation of the assertion.
2 If both Assertion & Reason are true but the reason is not the correct explanation of the assertion.
3 If Assertion is true but Reason is false.
4 If Assertion is false but Reason is true.
Explanation:
Both Assertion & Reason are true but reason is the correct explanation of the assertion. So the option (1) is correct.
In general, the atomic and ionic radii increases on moving down in a group. But the element of second transition series (eg.,Zr, Nb, Mo etc.,) have the almost same radii as the elements of third transition series (eg. Hf, Ta, W etc.). This is because of lanthanide contraction.
CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES
313254
Which ion has the largest radius?
1 \(\mathrm{Se}^{2-}\)
2 \(\mathrm{F}^{-}\)
3 \(\mathrm{O}^{2-}\)
4 \(\mathrm{Rb}^{+}\)
Explanation:
On moving down the group, atomic radius increases, while it decreases on moving from left to right. However, for isoelectronic species, the atomic radius decreases with increase in atomic number. Further, larger the charge on the anion, greater is the radius. Hence, on considering all the factors, \(\mathrm{Se}^{2-}\) would possesses largest ionic radius among the given options.
CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES
313255
Assertion : The negative ion is always larger in size than its atom. Reason : As the number of electrons increases, the nuclear charge per electron is reduced.
1 If both Assertion & Reason are true and the reason is the correct explanation of the assertion.
2 If both Assertion & Reason are true but the reason is not the correct explanation of the assertion.
3 If Assertion is true but Reason is false.
4 If Assertion is false but Reason is true.
Explanation:
Both Assertion & Reason are true but reason is the correct explanation of the assertion. So the option (1) is correct.
In general, the atomic and ionic radii increases on moving down in a group. But the element of second transition series (eg.,Zr, Nb, Mo etc.,) have the almost same radii as the elements of third transition series (eg. Hf, Ta, W etc.). This is because of lanthanide contraction.
CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES
313254
Which ion has the largest radius?
1 \(\mathrm{Se}^{2-}\)
2 \(\mathrm{F}^{-}\)
3 \(\mathrm{O}^{2-}\)
4 \(\mathrm{Rb}^{+}\)
Explanation:
On moving down the group, atomic radius increases, while it decreases on moving from left to right. However, for isoelectronic species, the atomic radius decreases with increase in atomic number. Further, larger the charge on the anion, greater is the radius. Hence, on considering all the factors, \(\mathrm{Se}^{2-}\) would possesses largest ionic radius among the given options.
CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES
313255
Assertion : The negative ion is always larger in size than its atom. Reason : As the number of electrons increases, the nuclear charge per electron is reduced.
1 If both Assertion & Reason are true and the reason is the correct explanation of the assertion.
2 If both Assertion & Reason are true but the reason is not the correct explanation of the assertion.
3 If Assertion is true but Reason is false.
4 If Assertion is false but Reason is true.
Explanation:
Both Assertion & Reason are true but reason is the correct explanation of the assertion. So the option (1) is correct.
In general, the atomic and ionic radii increases on moving down in a group. But the element of second transition series (eg.,Zr, Nb, Mo etc.,) have the almost same radii as the elements of third transition series (eg. Hf, Ta, W etc.). This is because of lanthanide contraction.
CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES
313254
Which ion has the largest radius?
1 \(\mathrm{Se}^{2-}\)
2 \(\mathrm{F}^{-}\)
3 \(\mathrm{O}^{2-}\)
4 \(\mathrm{Rb}^{+}\)
Explanation:
On moving down the group, atomic radius increases, while it decreases on moving from left to right. However, for isoelectronic species, the atomic radius decreases with increase in atomic number. Further, larger the charge on the anion, greater is the radius. Hence, on considering all the factors, \(\mathrm{Se}^{2-}\) would possesses largest ionic radius among the given options.
CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES
313255
Assertion : The negative ion is always larger in size than its atom. Reason : As the number of electrons increases, the nuclear charge per electron is reduced.
1 If both Assertion & Reason are true and the reason is the correct explanation of the assertion.
2 If both Assertion & Reason are true but the reason is not the correct explanation of the assertion.
3 If Assertion is true but Reason is false.
4 If Assertion is false but Reason is true.
Explanation:
Both Assertion & Reason are true but reason is the correct explanation of the assertion. So the option (1) is correct.
