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Standard XII

Chemistry

Electronic Configuration

What is the g...

Question

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

M_{2} O

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M O

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M_{2} O_{3}

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M O_{2}

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Solution

The correct option is A $M_{2} O$
Francium is a chemical element with the symbol Fr and atomic number 87.
Electronic configuration of $M$ is $[R n]^{86} 7 s^{1}$ . 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 $M_{2} O$ .

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Electronic Configuration

Standard XII Chemistry

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

The correct option is A M2OFrancium is a chemical element with the symbol Fr and atomic number 87.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.

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