1. Which are closer together—the two nuclei within potassium fluoride, KF, or the two nuclei within molecular fluorine, F 2 ? Explain. 2. Two fluorine atoms join together to form a covalent bond. Why...

1. Which are closer together—the two nuclei within potassium fluoride, KF, or the two nuclei within molecular fluorine, F₂? Explain.

2. Two fluorine atoms join together to form a covalent bond. Why don’t two potassium atoms do the same thing?

3. What drives an atom to form a covalent bond—its nuclear charge or the need to have a filled outer shell? Explain.