Question

an atom of an element has 7 electrons in its M shell. A- what is its atomic number? B-state its valency. C- identify the element .​

Answer 1

Answer:

Atomic Number: 17

Valency: 7

Element: Chlorine(Cl)

Explanation:

If it has 7 electrons in the M shell it means that the K and L shells are filled, which can fill 2 and 8 electrons respectively.

Therefore, the total comes out to be=> 2+8+7=17(Atomic Number)

Now, valency in general is the number of outermost electrons which here is 7.

Finally, the element having atomic number 17 is Chlorine(Cl).

Hope it helps you:)

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