Question

Can someone help with 10 a and b please

Answer 1

Answer:

for question a element A and B are isobars

for question b element C and D have the same atomic numbers.

Explanation:

1. element A and B are isobars because they have the same mass numbers but different atomic numbers. The different atomic numbers is  as a result of the difference in proton number of each elements A and B. (A and B are two different elements).
2. element C and D are isotopes of the same element  because they have the same atomic numbers (same number of protons) but differ in number of neutrons resulting in the different number of mass numbers. (C and D are the same elements)