Out of the elements X having mass no. 34 and atomic no. 17 and element Y having atomic mass 18 and mass no. 40 which is chemically more reactive? Assign reason.

Element X has atomic number -17 and element Y has atomic number - 18. Element X has 7 electrons in its valence shell whereas Y has 8 electrons which means Y has noble gas configuration and X is one electron short of attaining one. Therefore, X is more reactive than Y. 

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X is more reactive then Y because the valency of X is 1 and of Y is 0 therefore X has more combining capacity with other atoms therefore it is more reactive
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