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Which of the following pairs has elements containing same number of electrons in the outermost orbit?

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Ca, Cl

N, O

Na, Cl

Cl, Br

answer is D.

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Detailed Solution

Cl and Br both contains same number of electrons in outermost orbital since they belong to same group i.e. VIIA or 17^th group.

Valence shell configurations are,

Cl --- 3s²3p⁵

Br --- 4s²4p⁵

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