Question

Anatom of an element has two electrons in the outermost M shell. State
(a) Electronic configuration (b) Atomic number
(b) Number of protons (d) Valency of this element
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Answer 1

Since the element has 2 electrons in it s M shell, it’s

Atomic no : 12

Electronic configuration : 2,8,2

Number of protons : 12

Valency : 2

Name of the element : Magnesium

Answer 2

Hey mate here is your answer:-

*The element whose valance, electron 2 belongs to the gr-we

oup 2 of the modern periodic tables like :-magnesium .

Electronic configuration of magnesium:-

Mg (12 ):-k L M

2 8 2

*Since atomic number is equal to the number of protons of any element, hence magnesium has 12 protons hence its Atomic No. =12.

*Since vallancey of the element is the combining capacity of the element, since magnesium has to balance electron in its outermost shell, hence it has 2 Valence.

Hope it helps!!