Toane 2. A chemical formula is an expression used
to represent
(1) mixtures only (3) compounds only
(2) elements only (4) elements and
compounds

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.

catya your not at all which answer i've seen you do this on another question!

c) should be the answer.