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?
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Answer 1

Answer: a) Lithium, sodium and potassium all react with water to form alkalis, i.e., lithium hydroxide, sodium hydroxide, potassium hydroxide, etc. with the liberation of hydrogen gas. All these metals have one electron in their respective outermost shells.

b) It belongs to the last group with all the gas whose last shell are common and they are unreactive unlike to other elements which reacts to complete there last shell with total 8 electrons . Helium and Neon have in common that they have there shell complete and they reacts very less or they don't

hope it helps

Answer 2

Answer:

(a) Lithium, sodium and potassium all react with water to form alkalis, i.e., lithium hydroxide, sodium hydroxide, potassium hydroxide, etc. with the liberation of hydrogen gas. All these metals have one electron in their respective outermost shells.