Question

(1) Lithium, sodium and potassium are all metals
that react with water to liberate hydrogen gas. Is
there any similarity in the atoms of these elements.
(ii) Helium is an unreactive gas and neon is a gas of
extremely low reactivity. What, if anything do their
atoms have in common?
in their outermost.
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Answer 1

Answer:

1.yes.

Explanation:

1.The 3 atoms have 1 electron in their valence shell. Which makes their valency same. And they belongs to same period.

2. They have 2 electrons in their outermost cell. And their valency is same. Also they belongs to same period. They are called noble metals. And they are unreactive.