how does valency change from K to Ca.
science - class 10. periodic classifocation
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In a period the number of electrons is added in the same valence shell and the atomic number increases from left to right. ... Similarly, the valency first increases from 1-4 and then decreases from 4-0 due to the strong nuclear positive charge in a period.
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k atomic no. is 19. It is a valency is 1. because group no. 1 and atomic size is large.
Ca atomic no is 20 . It is a valency is 2 because group no. is 2
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