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Question

What is the general formula for oxide of element M with atomic number 87?

A
M2O
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B
MO
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C
M2O3
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D
MO2
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Solution

The correct option is A M2O
Electronic configuration of M is [Rn]867s1. Since M has one electron in outermost s orbital its valency will be 1 i.e, alkali metal. Hence, the general formula of its oxide is M2O.

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