An element X has a mass number 4 and atomic number 2. The valency of this element is:

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Solution

The correct option is A 0
If the atomic number is $2$ , then the number of valence electrons are $2$ . Therefore, the electronic configuration is $2$ , which is a stable and fully filled. Thus, it does not involve in bond formation and valency is zero.

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An element X has a mass number 4 and atomic number 2. The valency of this element is:

The correct option is A 0If the atomic number is 2, then the number of valence electrons are 2. Therefore, the electronic configuration is 2, which is a stable and fully filled. Thus, it does not involve in bond formation and valency is zero.

The correct option is A 0
If the atomic number is $2$ , then the number of valence electrons are $2$ . Therefore, the electronic configuration is $2$ , which is a stable and fully filled. Thus, it does not involve in bond formation and valency is zero.