Chemical bonds are likely to form when
a. two atoms have the same number of electrons.
b. an atom’s outer energy level doesn’t have the maximum number of electrons.
c. an atom’s nucleus has the same number of protons as neutrons.
d. an atom’s outer energy level is filled

The correct answer is option b. an atom’s outer energy level doesn't have the maximum number of electrons.

Explanation:

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For a chemical bond to form, the elements must have the last level of energy that is not complete, to be able to complete it through chemical bonding. Thus, noble gases (whose last energy level is complete), do not form chemical bonds.

After analysis, we conclude that the correct answer is option b. an atom’s outer energy level doesn't have the maximum number of electrons.

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