The table gives the nucleon number and the number of neutrons in one atom of isotopes W, X, Y and Z. Which statement about W, X, Y and Z is correct?
- AW and X are isotopes of the same element.
- BX and Y are isotopes of elements in the same group of the Periodic Table.
- CY and Z are isotopes of elements in the same period of the Periodic Table.
- DZ has a higher proton number than Y.