2(a)
Arrange the following as per the instruction given in the brackets:
(i) He, Ar, Ne (Increasing order of the number of electron shells)
(ii) Na, Li, K (Increasing Ionisation Energy)
(iii) F, Cl, Br (Increasing electronegativity)
(iv) Na, K, Li (Increasing atomic size)
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(i) He < Ne < Ar
Reason — Number of electron shells increases as we move down the group.
(ii) K < Na < Li
Reason — Ionization Potential decreases as we move down the group.
(iii) Br < Cl < F
Reason — Electronegativity decreases as we move down the group.
(iv) Li < Na < K
Reason — Atomic Size increases as we move down the group.