According to the Brönsted-Lowry theory, an acid is 1. a proton donor only
2. a proton acceptor only
3. a proton donor and a proton acceptor
4. neither a proton donor nor a proton acceptor

i don't see a text, but i am gonna assume this *orbit* the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun.

answer; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;