The formula of compounds formed when Na combines with two different metals X and Y at different times are Na2X and NaY respectively
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that means X have valency 2 and Y has valency 1 y potassium and x zinc
gandhirenuka27p4ahub:
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Identify the groups in which X and Y would be placed in modern periodic table
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potassium and zinc.....
How it can be determined
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