Question
Question: The reason behind the lower atomic radius ofj Ga as compared to Al is....
The reason behind the lower atomic radius ofj Ga as compared to Al is.
A
Poor screening effect of d – electrons for the outer electrons from increased nuclear charge.
B
Increased formce of attraction ofj increased nuclear charge on electrons
C
Increased ionisation enthalpy of Ga as compared to Al
D
Anomalous behaviour of Ga.
Answer
Poor screening effect of d – electrons for the outer electrons from increased nuclear charge.
Explanation
Solution
: Presence of 10 d – electrons in gallium which have poor screening effect on the outer electrons increases the force of attraction between the outermost electrons and nuclear charge resulting in decrease in atomic radius.