The numbers of subatomic particles present in four species W, X, Y and Z are given in the table.
Species | Number of protons | Number of neutrons | Number of electrons |
W | 19 | 20 | 18 |
X | 19 | 20 | 19 |
Y | 20 | 20 | 18 |
Z | 20 | 22 | 20 |
Which of these species are isotopic?
W and X
W and Y
X and Z
Y and Z
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