Question

which has the highest ionization energy? (hint: remember the octet rule. if an element already has its perfect octet, does it want to gain or lose electrons?) neon (ne) chlorine (cl) sodium (na) tungsten (w)

Explanation:

Ionization energy is the energy required to remove an electron from an atom. Neon is a noble - gas with a full octet in its outer shell. It is very stable and does not want to lose electrons, so it has a high ionization energy. Chlorine needs to gain one electron to achieve an octet, sodium easily loses one electron to achieve an octet, and tungsten is a metal that can lose electrons relatively easily compared to a noble - gas.

Answer:

Neon (Ne)