Q.4 An atom has its atomic number 18 and atomic mass number 40. Find out the number of protons,
neutrons and electrons and represent the element symbolically. Also draw its atomic structure.
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Explanation:
Given atomic number = 18
so,
number of protons = 18
Since,
An atom is neutral,
no. of electrons =18
Now,
Mass number=40
so,
no. of neutrons = 40-18
=22
so,
electronic configuration = 2,8,8
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