JEE Main · 2023 · 25 Jan 2023 · Shift 2 · Classification of Elements and Periodicity

Which of the following represents the correct order of metallic character of the given elements?

(A)Si<Be<Mg<K✓ Correct
(B)Be<Si<Mg<K
(C)K<Mg<Be<Si
(D)Be<Si<K<Mg

Answer: (A)

Solution

Metallic character grows down a group as the ionisation energy falls and weakens across a period as the nuclear pull rises. Potassium, an alkali metal of the fourth period, is the most metallic; magnesium, lying below beryllium, exceeds beryllium; and silicon, a metalloid of group 14, is the least metallic of the four. In order of increasing metallic character the arrangement is silicon, then beryllium, then magnesium, then potassium.

JEE Main · 2023 · 25 Jan 2023 · Shift 2 · Single correct option

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