Which pair of elements has the same chemical | vedclass

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(B) The correct answer is $(b)$.Elements with the same number of valence electrons exhibit similar chemical properties.Atomic number $3$ corresponds t

Vedclass · Accepted Answer

$3, 11$

Vedclass · Answer

(B) The correct answer is $(b)$.Elements with the same number of valence electrons exhibit similar chemical properties.Atomic number $3$ corresponds to Lithium $(Li)$,which has the electronic configuration $[He] 2s^1$.Atomic number $11$ corresponds to Sodium $(Na)$,which has the electronic configuration $[Ne] 3s^1$.Both elements belong to Group $1$ (alkali metals) and have $1$ valence electron,thus they possess similar chemical properties.

Which pair of elements has the same chemical properties?

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