Question

Account for the following: (1) All the elements of the same group have similar properties. (2) The noble gases were discovered late .

Answer 1

Your answer is

1. All the element in same group have same properties because they have arranged the element of same properties in same group .

2. The noble gas has been discovered late because it is an extermily unreactive gas .

Answer 2

its actually because of the similar e.c and noble gases are found independantly in nature