JAMB Chemistry 1978 Question 41

Five atoms T, W, X, Y, Z, consist of the following particles:
Proton: T 13, W 16, X 17, Y 19, Z 20
Electron: T 13, W 16, X 17, Y 19, Z 20
Neutron: T 14, W 16, X 35, Y 20, Z 20
Which of the five atoms can be described by the following properties: Relative atomic mass is greater than 30 but less than 40, it has odd atomic number and forms a unipositive ion in solution?

1. A.T
2. B.W
3. C.X
4. D.Y
5. E.Z.