Which of the following are also compounds? Select all that apply. A.
H2O

B.
CuFeS2

C.
Cl

D.
Mg

E.
KCl

b. accuracy of the data matters alot more than its number of digits, organization or amount of detail. quantitative observation is more accepted than the qualitative observation.

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.