Question

identifying atoms that form covalent
which of these atoms is most likely to share electrons with other atoms?

Explanation:

Atoms share electrons (form covalent bonds) when they need to achieve a stable electron configuration (usually a full outer shell). Helium (He) has a full outer shell (2 electrons in the first shell), so it is stable and does not share electrons. Argon (Ar) is a noble gas with a full outer shell (8 electrons in the outermost shell), so it is also stable and does not share electrons. Sodium (Na) has 1 electron in its outer shell. It is more likely to lose this electron (form an ionic bond) to achieve a stable configuration. Fluorine (F) has 7 electrons in its outer shell. It needs 1 more electron to complete its outer shell (8 electrons). So, it is most likely to share electrons (form a covalent bond) to achieve a stable configuration.

Answer:

F (Fluorine)