Question

The element lithium sodium and potassium each having one valence electrons are in period 2 3 and 4 respectively of modern periodic table in which group of the periodic table they should they be the which one of them is least reactive see which one of them has the largest atomic radius give reason to justify your answer in each case

Answer 1

Lithium, sodium and potassium come in the 1 st group as they have 1 valence electron in the outermost shell.

Potassium is the least reactive as reactivity decereases down the group.

Lithium has the largest atomic radius as the atomic size (radius) also decreases down the group