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Classification of Elements and Periodicity in Properties
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26/08/2021 11:49 am
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The first ionisation potential of aluminium is smaller than that of magnesium because
(a) Atomic size of Al > Atomic size of Mg.
(b) Atomic size of Al < Atomic size of Mg.
(c) Al has one electron in p - orbital
(d) None of these
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26/08/2021 11:52 am
Correct answer: (c) Al has one electron in p - orbital
Explanation:
Al (3s2 p1) and Mg (3s2). Lower energy is required to remove 3p1 electron than 3s1 electron (penetrating effect is s > p > d > f). Secondly Mg has stable electronic configuration than Al.