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Q.

Which element has two electrons in the outermost M-shell?

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a

Calcium

b

Helium

c

Chlorine

d

Magnesium

answer is B.

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Detailed Solution

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The element with two electrons in the outermost M-shell is magnesium.

The atom has two electrons in the outermost M-shell, this means that K and L shells are completely filled. Therefore, electronic configuration is 2(K) 8(L) 2(M). The total number of electrons is 12.  The element whose atomic number is 12 is magnesium.

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