Which row shows elements in order of increasing first ionisation energy?
Na<Mg<Al<N\text{Na} < \text{Mg} < \text{Al} < \text{N}Na<Mg<Al<N
Na<Al<Mg<N\text{Na} < \text{Al} < \text{Mg} < \text{N}Na<Al<Mg<N
N<Mg<Al<Na\text{N} < \text{Mg} < \text{Al} < \text{Na}N<Mg<Al<Na
Mg<Al<Na<N\text{Mg} < \text{Al} < \text{Na} < \text{N}Mg<Al<Na<N
