Fluorine has 7 valence electrons. How many more electrons does it need to achieve a full outermost energy level? How do you know?

a. a primary source combines several different accounts of an event. b. a primary source generally benefits from having been written after an event.

explanation:

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

plz give brainliest

the answer is b & c i believe : )

it means there are 3 atoms of oxygen