1.

Metallic properties of the elements change to non metallic properties as one moves from left to right in aperiod of periodic table. Give reason ​

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EXPLANATION:

when you move in periodic table you notice METALS at first and later non metals

so propeties too change . because also GOING NEARER to inert gas(right most) the valency becomes 0 and again starts with 1 in next period..

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