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Atomic Number and Mass Number

in the ground...

Question

in the ground state,an element has 13 electrons in its M-shell.the element is
(1) manganese
(2) cobalt
(3) nickel
(4) iron

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Solution

(1) manganese

The electronic configuration of manganese is 1s2 2s2 2p6 3s2 3 p6 3d5 4s2. Mn has 13 electron in M (3) shell.

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