Mass no. Of calcium is 40 and electronic configuration is 2,8,8,2. The the no. Of neutron
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As the electronic cpnfiguration is 2,8,8,2 the no of electrons would be 8+8+2+2=20. As the no of electrons is same as the no of protons then no of protons=20
Mass no.=No of protons + No of neutrons
40= 20 + No of neutrons
40-20= No of neutrons
Hence no of neutrons =20
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Atomic no. of Ca= 20 &
Mass no. Of Ca=40 &
As we know that,
No. of neutron(n)= Mass no.(M) -- Atomic no.(Z)
So, n= 40 - 20= 20
Hence, there are 20 neutrons in calcium atom.
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