11. which of the following accurately describes properties of valence? a. nonmetallic elements tend to have a positive valence and tend to be electron borrowers. b. the smaller the number of electrons an atom has to borrow or to lend, the greater the activity of the atom. c. metals tend to have a negative valence and tend to be electron borrowers. d. the greater the number of electrons an atom has to borrow or to lend, the greater the activity of the atom.

- "the choice that is not an indicator of a chemical change is "state of matter changes". more common than not, chemical reactions produce energy in the form of light or heat. along with energy, they also produce a new substance called the product that could be in any state of matter (solid, gas, or liquid)."

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.