Characterization of elements according to periodic table
Example., P-phosphorus, period-5, group-15 or Va; atomic number Z=15, number of protons P=15, number of electrons e=15; relative atomic mass Ar=31; nonmetal
O-oxygen, period-2, group-16 or VIa; atomic number Z=8, number of protons P=8, number of electrons e=8; relative atomic mass Ar=16; number of neutrons n=16-8=8; nonmetal
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