Chapter 5 - Electron Configurations and the Periodic Table - Exercise 5.9 - Quantum Numbers - Page 210: b

For an electron in 2p atomic orbital, possible values can be: $n = 2, l= 1, m_{l} = 0, m_{s} = -1/2 $ $n = 2, l= 1, m_{l} = 0, m_{s} = 1/2 $ $n = 2, l= 1, m_{l} = 1, m_{s} = -1/2 $ $n = 2, l= 1, m_{l} = 1, m_{s} = 1/2 $

Given above