Question

An element X belongs to 3^rd period and 17^th group, state

1. no. of valence electrons in it.
2. name of the element.
3. name the family to which it belongs.
4. write the formula of the compound formed when X reacts with \[\ce{^{27}_{13}Y}\]

Answer 1

1. 7 valence electrons (2, 8, 7)
2. Chlorine (Cl)
3. Halogen family
4. YBr₃