how does the valency of elements change on moving from left to right in the fourth period of the periodic table
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On moving from left to right in a period, the chemical reactivity of elements first decreases and then increases. On moving from left to right in a period, the number of valence electrons increases from 1 to 8. On Moving from left to right in a period, the atomic size decreases; the size of the atoms decreases.
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On moving from left to right in a periodic table valency of elements increases than suddenly decreases...
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