Answer:
Sodium (Na), At. number 11, 2, 8, 1
Magnesium (Mg), At. number 12, 2, 8, 2
Aluminium (Al), At. number 13, 2, 8, 3
(a) The element having the highest valency is Al, as it has 3 valence electrons.
(b) The element with the largest atomic radius is Na as left to right atomic radius decreases.
(c) The element with maximum chemical reactivity is Na as metallic character decreases left to right.
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