Select the correct answer from each drop down menu What causes atoms to form covalent bonds?
In a covalent bond, two atoms are held together by the attraction between . The number of covalent bonds that an atom can form depends on the number of in the atom.

For part A the drop down options are:
-each atom and the shared electrons
- the nuclei of the two atoms
- the valence electrons of the two atoms

For the second one the options are
- energy levels
- protons and neutrons
- valence electrons