calculate the number of electron proton and neutron in an atom of an element with atomic number 20 and mass number 40 write the electronic configuration and draw the structure of atom
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atomic no(z)-20= electron=proton
atomic mass (a)-40
neutron=a-z
=20
electronic configuration-1s²,2s²,2p6,3s2,3p6,4s2
atomic mass (a)-40
neutron=a-z
=20
electronic configuration-1s²,2s²,2p6,3s2,3p6,4s2
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