Answer:
C. 3 Li
Explanation:
Nitrogen has 7 electrons, which you can find on a periodic table. Let's figure out what its valence is, or how many electrons are in its outer shell!
We know that the first shell is filled with 2 electrons. Then the next shell is filled when it has 8 electrons, but we've only got 7 - 2 = 5 electrons left.
So nitrogen N has 5 valence electrons. That means it wants to bind with something that can offer it <u>3 electrons to share.</u>
A. 2 Ca atoms have 2 * 2 = 4 valence electrons.
B. 1 H atom has 1 valence electron.
C. 3 Li atoms have 3 valence electrons. <em>This could be our winner! Check D anyways.</em>
D. 2 C atoms have 4 * 2 = 8 valence electrons.
So the only one that works is C. 3 Li atoms.
