Question

12. .
The nuclei of elements X, Y and Z have same number of
protons, but different numbers of neutrons. According to
. Modern periodic table, the elements X, Y and Z
(a) belong to same group and same period
(b). belong to different groups and different periods
(c) belong to same group and different periods
(d) are isotopes, which do not have different problems
​

Answer 1

Answer:

C

Explanation:

In a group elements have same number of protons