An atom of an element has 7 electron in the 'M' shell.Write the electronic configuration and predict its valency.

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Solution

Dear student
if an element has 7 electrons in the M shell, the element will be Phosphorous P.
K, L, M
2, 8, 7
Its electronic configuration is 1s²2s²2p⁶3s²3p³.
and valency is 3 {as there are 3 electrons in the valence shell}

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