Question

the strong force keeps the nucleus of an atom from flying apart. why would the atom be in danger of falling apart?
a the like charges between neutrons would move them apart.
b the like charges between protons would move them apart.
c the charge of the nucleus would not hold the electrons.
d the protons would otherwise be attracted to the electrons.

Explanation:

Protons in the nucleus have a positive charge. Like - charged particles repel each other. Without the strong force to counteract this repulsion, the like - charges between protons would cause them to move apart and the nucleus to fall apart. Neutrons are neutral, so option A is incorrect. Option C is about the interaction between nucleus and electrons which is not relevant to the nucleus falling apart. Option D is also about proton - electron attraction which is not the reason for nucleus disintegration.

Answer:

B. The like charges between protons would move them apart.