Question

On the boxes of the numbers of protons, neutrons and electrons in samples given below identify a,the cation b, the pair of isobarsc,the pair of isotopes Sample. Protons. Neutrons. Electrons. A. 17. 18. 16. B. 18. 19. 18. C. 17. 20. 17.

Answer 1

A)
No. of Protons = 17
No. of Neutrons=18
No. of electrons=16
As no. of protons > no. of electrons this is a Cation.

B)
No. of Protons = 18
No. of Neutrons=19
No. of electrons=18

C)
No. of Protons = 17
No. of Neutrons=20
No. of electrons=17

Isotopes have same atomic no (i.e. no of protons) as no. of protons in A&C are same they are isotopes.
Isobars have same mass no. i,e no of protons + neutrons
Mass nos. of A,B,C are 35, 37, 37 thus B & C are isobars.