Fill in the blank: form when two or more elements combine chemically.

A.
Atoms

B.
Compounds

C.
Electrons

D.
Amino acids

I think it is B: Compounds.

Explanation:

I think it is B: Compounds because it says whit forms when two or more elements combine chemically and the key word of compounds is: combine. So yeah, hope this helps.

a:

by the combination of an unlimited number of elements

because u need two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei to form isotopes.

so since they all have the same shape? i mean maybe because m& m and reeses are both chocolates