Question

All the elements of a group have similar chemical properties.Why
please explain​

Answer 1

Answer:

Because they have either same or almost same number of valence electrons and they have been placed in such a manner on the periodic table.

Answer 2

Answer:

All the elements of a group have similar chemical properties because they have same no. of valence electrons in their outermost shell. (ii) All the elements of a period have different chemical properties because they have different no. of valence electrons in their atoms.