CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES
313162
Arrange the following in order of increasing atomic radii Na, Si, Al, Ar
1 Na < Si < Al < Ar
2 Si < Al < Na < Ar
3 Ar < Al < Si < Na
4 Na < Al < Si < Ar
Explanation:
Conceptual Questions
CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES
313163
Identify the incorrect statements among the following:
1 Lanthanoids contraction is the accumulation of successive linkages
2 As a result of lanthanoids contraction, the properties of 4d series of the transition elements have no similarities with 5d series of transition elements.
3 Shielding power of 4f electrons is quite weak.
4 There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.
Explanation:
In each vertical column of transition element, the elements of second and third transition series resemble each other more closely than the elements of first and second transition series on account of lanthanoids con traction. Hence, the properties of elements of 4d series of the transition elements resemble with the properties of the elements of 5d series of thhe transition elements.
CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES
313164
Choose the correct statement.
1 For cesium, the atomic radius \( < \) ionic radius; but for bromine, the atomic radius \(>\) ionic radius
2 For cesium and bromine both, the atomic radii \(>\) ionic radii
3 For cesium and bromine both, the atomic radii \( < \) ionic radii
4 For cesium, the atomic radius \(>\) ionic radius but for bromine, the atomic radius \( < \) ionic radius
Explanation:
anion radii is greater than normal atom and cation radii is smaller than normal atom. Cesium forms cation, \({\rm{C}}{{\rm{S}}^{\rm{ + }}}\), Hence, atomic radius is greater tha ionic radius.Bromine forms anion,Br, Hence, atomic radius is less than ionic radius.
CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES
313165
In which one of the following sets, elements have nearly same atomic radii ?
1 Li, Be, B, C
2 Mg, Ca, Sr, Ba
3 Fe, Co, Ni, Cu
4 O, S, Se, Te
Explanation:
In 3d-elements particularly from Fe to Cu, the contractive effect of the increased nuclear charge is almost balanced by increase in size due to increasing shielding effect. As a result, elements, Fe, Co, Ni, Cu all have nearly the same atomic radii.
CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES
313162
Arrange the following in order of increasing atomic radii Na, Si, Al, Ar
1 Na < Si < Al < Ar
2 Si < Al < Na < Ar
3 Ar < Al < Si < Na
4 Na < Al < Si < Ar
Explanation:
Conceptual Questions
CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES
313163
Identify the incorrect statements among the following:
1 Lanthanoids contraction is the accumulation of successive linkages
2 As a result of lanthanoids contraction, the properties of 4d series of the transition elements have no similarities with 5d series of transition elements.
3 Shielding power of 4f electrons is quite weak.
4 There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.
Explanation:
In each vertical column of transition element, the elements of second and third transition series resemble each other more closely than the elements of first and second transition series on account of lanthanoids con traction. Hence, the properties of elements of 4d series of the transition elements resemble with the properties of the elements of 5d series of thhe transition elements.
CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES
313164
Choose the correct statement.
1 For cesium, the atomic radius \( < \) ionic radius; but for bromine, the atomic radius \(>\) ionic radius
2 For cesium and bromine both, the atomic radii \(>\) ionic radii
3 For cesium and bromine both, the atomic radii \( < \) ionic radii
4 For cesium, the atomic radius \(>\) ionic radius but for bromine, the atomic radius \( < \) ionic radius
Explanation:
anion radii is greater than normal atom and cation radii is smaller than normal atom. Cesium forms cation, \({\rm{C}}{{\rm{S}}^{\rm{ + }}}\), Hence, atomic radius is greater tha ionic radius.Bromine forms anion,Br, Hence, atomic radius is less than ionic radius.
CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES
313165
In which one of the following sets, elements have nearly same atomic radii ?
1 Li, Be, B, C
2 Mg, Ca, Sr, Ba
3 Fe, Co, Ni, Cu
4 O, S, Se, Te
Explanation:
In 3d-elements particularly from Fe to Cu, the contractive effect of the increased nuclear charge is almost balanced by increase in size due to increasing shielding effect. As a result, elements, Fe, Co, Ni, Cu all have nearly the same atomic radii.
CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES
313162
Arrange the following in order of increasing atomic radii Na, Si, Al, Ar
1 Na < Si < Al < Ar
2 Si < Al < Na < Ar
3 Ar < Al < Si < Na
4 Na < Al < Si < Ar
Explanation:
Conceptual Questions
CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES
313163
Identify the incorrect statements among the following:
1 Lanthanoids contraction is the accumulation of successive linkages
2 As a result of lanthanoids contraction, the properties of 4d series of the transition elements have no similarities with 5d series of transition elements.
3 Shielding power of 4f electrons is quite weak.
4 There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.
Explanation:
In each vertical column of transition element, the elements of second and third transition series resemble each other more closely than the elements of first and second transition series on account of lanthanoids con traction. Hence, the properties of elements of 4d series of the transition elements resemble with the properties of the elements of 5d series of thhe transition elements.
CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES
313164
Choose the correct statement.
1 For cesium, the atomic radius \( < \) ionic radius; but for bromine, the atomic radius \(>\) ionic radius
2 For cesium and bromine both, the atomic radii \(>\) ionic radii
3 For cesium and bromine both, the atomic radii \( < \) ionic radii
4 For cesium, the atomic radius \(>\) ionic radius but for bromine, the atomic radius \( < \) ionic radius
Explanation:
anion radii is greater than normal atom and cation radii is smaller than normal atom. Cesium forms cation, \({\rm{C}}{{\rm{S}}^{\rm{ + }}}\), Hence, atomic radius is greater tha ionic radius.Bromine forms anion,Br, Hence, atomic radius is less than ionic radius.
CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES
313165
In which one of the following sets, elements have nearly same atomic radii ?
1 Li, Be, B, C
2 Mg, Ca, Sr, Ba
3 Fe, Co, Ni, Cu
4 O, S, Se, Te
Explanation:
In 3d-elements particularly from Fe to Cu, the contractive effect of the increased nuclear charge is almost balanced by increase in size due to increasing shielding effect. As a result, elements, Fe, Co, Ni, Cu all have nearly the same atomic radii.
CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES
313162
Arrange the following in order of increasing atomic radii Na, Si, Al, Ar
1 Na < Si < Al < Ar
2 Si < Al < Na < Ar
3 Ar < Al < Si < Na
4 Na < Al < Si < Ar
Explanation:
Conceptual Questions
CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES
313163
Identify the incorrect statements among the following:
1 Lanthanoids contraction is the accumulation of successive linkages
2 As a result of lanthanoids contraction, the properties of 4d series of the transition elements have no similarities with 5d series of transition elements.
3 Shielding power of 4f electrons is quite weak.
4 There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.
Explanation:
In each vertical column of transition element, the elements of second and third transition series resemble each other more closely than the elements of first and second transition series on account of lanthanoids con traction. Hence, the properties of elements of 4d series of the transition elements resemble with the properties of the elements of 5d series of thhe transition elements.
CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES
313164
Choose the correct statement.
1 For cesium, the atomic radius \( < \) ionic radius; but for bromine, the atomic radius \(>\) ionic radius
2 For cesium and bromine both, the atomic radii \(>\) ionic radii
3 For cesium and bromine both, the atomic radii \( < \) ionic radii
4 For cesium, the atomic radius \(>\) ionic radius but for bromine, the atomic radius \( < \) ionic radius
Explanation:
anion radii is greater than normal atom and cation radii is smaller than normal atom. Cesium forms cation, \({\rm{C}}{{\rm{S}}^{\rm{ + }}}\), Hence, atomic radius is greater tha ionic radius.Bromine forms anion,Br, Hence, atomic radius is less than ionic radius.
CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES
313165
In which one of the following sets, elements have nearly same atomic radii ?
1 Li, Be, B, C
2 Mg, Ca, Sr, Ba
3 Fe, Co, Ni, Cu
4 O, S, Se, Te
Explanation:
In 3d-elements particularly from Fe to Cu, the contractive effect of the increased nuclear charge is almost balanced by increase in size due to increasing shielding effect. As a result, elements, Fe, Co, Ni, Cu all have nearly the same atomic radii.
