Chemistry - PERIODIC TABLE Question with Solution | TestHub
Select the group in which the two species have almost same value of radius.
Options:
Answer:
Solution:
The correct option is D. Explanation:
1. and are isotopes of chlorine. Isotopes have the same number of protons but different numbers of neutrons. Since the number of electrons is the same, their atomic radii are almost identical.
2. Zr (Zirconium) and Hf (Hafnium) are in the same group (Group 4) but in different periods. However, due to the lanthanide contraction, Hf has an atomic radius very similar to that of Zr.
3. Al (Aluminum) and Ga (Gallium) are in the same group (Group 13). Normally, atomic radius increases down a group. However, due to the poor shielding effect of the d-electrons in Ga, its effective nuclear charge is higher, leading to a radius very similar to or even slightly smaller than Al.
Therefore, in all given pairs, the species have almost the same value of radius.
