Chemistry · Oct / Nov 2023 · Paper 11 · Question 4

The letters X, Y and Z represent different atoms. \[{}^{40}_{19}\text{X} \quad {}^{39}_{19}\text{Y} \quad {}^{40}_{20}\text{Z}\] Which statement is correct?

1. AX and Y are the same element.
2. BX and Z are the same element.
3. CX has more protons than Y.
4. DZ has more neutrons than Y.

As printed in the paper