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 unreactive gas and neon is a gas of extremely low reactivity.


What, if anything, do their atoms have in common.............?

Answer 1

Answer:

Explanation:

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

(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.

Answer 2

a)Yes, There are some similarities among those lithium, sodium, potassium. Because lithium, sodium, potassium are present in Group 1or IA, these alkali metals have only one valence electron in their highest energy orbitals.

These are soft, shiny, highly reactive metals. When these metals are exposed in air, these metals become tarnish

•b)Helium is an unreactive gas and neon is a gas of extremely low reactivity. These gases are known as inert gas

Because the valence electrons of Helium is (2)

and the valence electrons of Neon is (2),(8)

So the valence outermost layer is completely filled. So helium and neon categorised in the novel gas category.