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Noble Gases

An atom has t...

Question

An atom has the electronic configuration as 2,8,18,7.
a:-What is its atomic mass?
b:-To which of the following would it be chemically similar?
₇N_,17Cl_,15P_,18Ar.

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Solution

This element is having a total of 2+8+18+7=35 electrons. This is bromine.
It has an atomic mass of 80 amu.
It is a halogen and resembles to the element chlorine (₁₇Cl).

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