Question

Group 17 element are non metal and group 1 element are strong metal

Answer 1

yes,

due to it depends on how many valence electron in last shell.

Answer 2

Hey friend here is Ur answer

As group 17 has 7 electron in outer most shell and gain 1 electron to complete it duplet where as group 1 has 1 electron in outer most shall and loss 1 electron to complete it octlet

Hope it helps
thank u