When an atom's outer energy levels are not filled completely, the atom a. cannot form a compound b. is a noble gas c. can gain, lose, or share electrons d. is very stable

c. can gain, lose, or share electrons

Explanation:

The goal of every atom is to have a complete electronic configuration. But what does that mean?

It means atoms would react when they want to completely fill their atom's energy levels. This explains why noble gases rarely undergo reactions.

Option A is wrong because, when the atom's outer energy levels are not filled completely, the atom reacts to form a compound.

Option B is wrong because the noble gases are the atoms in which their outer energy levels is completely filled.

Option C is correct because depending on the number of valence electrons (outermost electrons)  an atom, can eitther gain (especially group 5,6 and 7), lose (groups 1,2 and 3) or share electrons (mainly group 4).

Option D is wrong because only the noble gases are stable.

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.

the electron configuration that you gave me has 16 electrons ergo it has 16 protons ergo it is the element sulfur.