An atom of an element (X) has its K, L and M shells filled with some electrons. It reacts with sodium metal to form a compound NaX. The number of electrons in the M shell of the atom (X) is

Eight

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Seven

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Two

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One

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Solution

The correct option is B
Seven

Valency of Sodium is 1. Since the element X forms compound with chemical formula NaX, it means, the valency of X =1. The number of electrons in the M shell of an atom of X will be seven.

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Q. An element has an atomic number

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. How many electrons will be present in

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and

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shells of its atom?

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An atom of an element (X) has its K, L and M shells filled with some electrons. It reacts with sodium metal to form a compound NaX. The number of electrons in the M shell of the atom (X) is

The correct option is B Seven Valency of Sodium is 1. Since the element X forms compound with chemical formula NaX, it means, the valency of X =1. The number of electrons in the M shell of an atom of X will be seven.

The correct option is B
Seven

Valency of Sodium is 1. Since the element X forms compound with chemical formula NaX, it means, the valency of X =1. The number of electrons in the M shell of an atom of X will be seven.