Question

what happens when atoms in a bond get too close to each other?
the bond length between the atoms gets shorter
electrons become tangled and make a stronger bond
the positive nuclei of atoms repel and the atoms move slightly away from each other
their nuclei combine and they change into a different element

Explanation:

Atoms have positively - charged nuclei. When atoms in a bond get too close, like - charged particles (nuclei) repel each other according to the electrostatic force principle. This causes the atoms to move slightly apart.

Answer:

The positive nuclei of atoms repel and the atoms move slightly away from each other