Among Na, Mg, Al, and Si, the atom with the LARGEST first ionization energy is
- A
Si (highest across the period)
- B
Na (lowest )
- C
Al (3p electron easier to remove)
- Dcheck_circle
Mg (filled 3s subshell stability)
Explanation
Across period 3, IE generally rises with , but Mg () and P () have anomalously high IEs from filled/half-filled stability. Among Na, Mg, Al, Si: Mg > Si > Al > Na. (Al has a 3p electron easier to remove than Mg's filled 3s.)