No. of electron shells in elements of period 1, period 2 and period 3.
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THERE ARE 2 ELECTRONS IN 1ST PERIOD WHILE BOTH PERIOD 2 AND 3 HAVE 8 ELECTRONS
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no of shell = 2n^2
in first period no of electrons is 1 elecron for hydrogen and 2 for Helium
in second period shell increased by 1
and in 3rd period shell increased by 1
in first period no of electrons is 1 elecron for hydrogen and 2 for Helium
in second period shell increased by 1
and in 3rd period shell increased by 1
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