which of the following elements would you expect to be stable and why?
2A⁴, 11B²³, 13C²⁷, 20D⁴⁰
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Answer:
2A'4 = He
11B'23 = Na
13C'27 = Al
20D'40 = Ca
all below He are reactive metal due to incomplete outershell
but,
'He(helium) ' have complete shell with 2 electrons and it is Nobel gas. so it is less reactive
reactivity inversely proportional to stability.
so, He more stable.
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