Which statement(s) is/are TRUE about covalent bonds?

covalent bonds can form between two nonmetal atoms

covalent bonds can form between atoms of the same element

covalent bonds can form between atoms of different elements

i would say b

explanation:

but i think i would need more information than that

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.