Atomic structure

Easy

The table shows information about some atoms and ions.

Atom or ion	Number of protons	Number of neutrons	Number of electrons
1	11	12	11
2	11	12	10
3	11	13	11
4	12	12	12

Which two are isotopes?

1 and 2

1 and 3

2 and 4

3 and 4

Atomic structure Questions