Which of the following elements does not form a chloride with the formula KCl?

_{39}^{19} T

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_{7}^{3} R

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_{23}^{11} Q

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_{42}^{20} S

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Solution

The correct option is B $_{42}^{20} S$
S is Ca so it will form $C a C l_{2}$ while all other forms MCl as they have only one valence electron.

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