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Question:

Aqueous solution of which salt will not contain ions with the electronic configuration 1s²2s²2p⁶3s²3p⁶?

NaF

CaI2

NaCl

KBr

Solution:

Na⁺ → 1s²2s²2p⁶
F⁻ → 1s²2s²2p⁶
Therefore, NaF contains ions with the electronic configuration 1s²2s²2p⁶.