(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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Lithium, Sodium , and potassium  are all metals having one free electron in them.  They become ions of 1 proton charge.  they have all valency of +1.  they all form  hydroxides and bases with water.  Chemical reactivity is high for these metals.

helium and neon have full number of electrons in their orbits in the atoms.  Both are called inert gases.  They have no affinity for becoming ions positive or negative.  they do not interact chemically with other elements.

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