Question

elements X and y having atomic number 17 and 18 which is chemically more reactive pehli Baar​

Answer 1

as elements X and Y are in same period

and reactivity decreases in a period

so element X with atomic number 17 is more reactive

Answer 2

Answer:

Element X will be more reactive

becoz it's has 7 valence electrons nd it needs 1 electron to become stable wheras element Z has completely filled shells so it is a noble and unreactive gas...