Question

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considering that there are only three fundamental forces in nature from which all other forces can be derived, which of the three are responsible for the forces between atoms that hold solid materials together?
it is the gravitational attraction (the gravitational force) between the atoms.
it is the nuclear strong force between the nucleons in the nuclei of the atoms.
the electroweak force because the bonding in materials is carried out by electrons (electric charges).

Explanation:

The gravitational force between atoms is extremely weak and not responsible for holding solid - materials together. The nuclear strong force acts within the nucleus and binds nucleons, not responsible for inter - atomic forces in solids. The electroweak force, specifically the electromagnetic part of it (as electrons are involved in bonding), is responsible for the forces between atoms that hold solid materials together.

Answer:

The electroweak force because the bonding in materials is carried out by electrons (electric charges).