3(iii)
Arrange the following as per the instruction given in the brackets:
(a) Al, K, Mg, Ca (decreasing order of its reactivity)
(b) N, Be, O, C (increasing order of non-metallic character)
(c) P, Si, F, Be (decreasing order of valence electrons)
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(a) K > Ca > Mg > Al
Reason — According to the electrochemical series metals at the top of the series are most reactive and the reactivity decreases down the group.
(b) Be < C < N < O
Reason — Across a period, left to right in a periodic table, the non-metallic character increases.
(c) F > P > Si > Be
Reason — The valence electrons decreases from right to left in the periodic table.