Question

Why does Group- 1 elements prefer to combine with Group-17 elements in periodic table?​

Answer 1

Group 1 elements are metals. Metals has tendency to lose electrons in short it is electropositive. while group 17 elements is halogens and required only one element to accquire noble core electronic configuration. thus it is highly electronegative. therefore group 1 elements combine with group 17 element

Answer 2

because the group 1member have +1valency and group 17member have -1 valency