The electron configuration of He(Z=2, A=4) is

The argon atom,,Ar(Z=18, A=40) has ……………. shells:

The calcium atom,,Ca(Z=20, A=40) belongs to

Group of the tritium atom, H(Z=1,A=3), is

The electron configuration of phosphorous (row 3 and column 15) is

Isotopes have:

Period is the:

Group is related to

The electron configuration of sulfur is: K2L8M6. Its period is

The electron configuration of sulfur is: K2L8M6. Its group is:

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