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Classification of Elements and Periodicity in Properties
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20/08/2021 12:11 pm
Topic starter
The set of three elements having successive atomic numbers and having the ionization energies of 2372, 520 and 890 kJ per mol is
(a) H, He, Li
(b) He, Li, Be
(c) Li, Be, B
(d) B, C, N
1 Answer
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20/08/2021 12:13 pm
Correct answer: (b) He, Li, Be
Explanation:
He (Z = 2) is a noble gas and has highest I.E. The I.E. of Be (Z = 4) is more than that of Li (Z = 3)