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1. 2 has more atomic size than 1
2. Increases from up to down
2. Increases from up to down
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The horizontal rows in the modern periodic table are known as groups.There are a total of 18 groups in the modern periodic table.
And the vertical columns of the modern periodic table are called periods.
1)element X will be having a larger atom size than that of Y.
2)As we move across a period metallic character decreases so X will be more metallic than Y.
3)as X and Y are in group 1 and 2 respectively their oxides will be X2O and YO respectively.
4) similarly molecular formula of their chlorides will be XCl and YCl2.
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