The eight elements from sodium through to argon are all in the same period of the Periodic Table. The equation for the first ionisation energy is given below. $\text{X}(g) \rightarrow \text{X}^+(g) + e^-$ Which one of these eight elements has the electron in this equation taken from a filled orbital?
- AMg, Al, Si, P, S, Cl and Ar
- BAl, Si, P, S, Cl and Ar only
- CMg, S, Cl and Ar only
- DS, Cl and Ar only