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neutron=nomor massa-nomor atom
a.Kalium(nomor atom=19 ; nomor masa=39)
proton=eloktron=19
neutron=20
b.Nitrogen(nomor atom=7 ; nomor massa=14)
proton=elektron=7
neutron=7
c.Litium (nomor atom=3 ; nomor massa=7)
proton=elektron=3
neutron=4
d.Kalsium(nomor atom=20 ; nomor massa=40)
proton=elektron=20
neutron=20