calculate the number fo electrons,protons,and neutron in atom of an element with atomic number20 and mass number40 .write eletronic configuration and draw the structure of an atom

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Solution

Atomic number = number of protons = number of electrons
So, number of electrons = 20
Number of protons = 20
Number of neutrons = Mass number - Atomic number
= 40 - 20
= 20

Electronic configuration = 2,8,8,2
The atom is calcium.

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