Question

Why do all elements of the a same group have similar properties b same period have different properties

Answer 1

Because as they all have same no. of valence electrons they have same no. of valency and thus they show similar chemical properties but not similar physical properties.

Answer 2

HIII.....

GOOD MORNING:-)

THIS IS BECAUSE THEY HAVE THE SAME NO OF VALENCE ELECTRONS AND HENCE SAME NO OF VALENCY.

HOPE THIS HELPS YOU....