Out of the elements X having mass no 34 and atomic no 17 and element Y having atomic - Science - Structure of the Atom

Question

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

Avni · Accepted Answer

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

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.