(a) Lithium, sodium,
Question.

(a) Lithium, sodium, potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements?

(b) Helium is an non-reactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common?

solution:

(a) Yes. The atoms of all the three elements lithium, sodium, and potassium have one electron in their outermost shell.

(b) Both helium (He) and neon (Ne) have filled outermost shells. Helium has a duplet in its K shell, while neon has an octet in its L shell.
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