the thoughts period contain only 8 elements even through the electron capacity of third shell is 18
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valency is the outer most orbit electrons
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because electronic configuration series like
(1s) (2s,2p) (3s,3p) (4s,3d,4p)............
so in 3s and 3p total no. of electrons r 8
(1s) (2s,2p) (3s,3p) (4s,3d,4p)............
so in 3s and 3p total no. of electrons r 8
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