Final answer:
a. Protons and electrons will attract each other due to opposite charges, which is the only attracting pair from the options provided.
Step-by-step explanation:
The question presented pertains to the interactions between various subatomic particles and which pairs will attract each other. In context, protons have a positive charge, electrons have a negative charge, and neutrons have no charge.
The electromagnetic force dictates that particles with opposite charges attract each other, and particles with like charges repel each other. Therefore, a proton (positively charged) and an electron (negatively charged) will attract each other due to their opposite charges (a). Neutrons, having no charge, do not interact via the electromagnetic force and thus do not attract protons or electrons based on charge. However, neutrons can interact with protons and other neutrons through the strong nuclear force within the nucleus, yet this does not cause attraction at a distance the way electromagnetism does between charged particles.
Therefore, electrons will not attract other electrons (c), as they both have the same charge, and similarly, neutrons will not attract each other (d), as they are electrically neutral. Consequently, the correct answer from the given options is only (a) Proton - Electron.
SUMUP:
- Proton and electron will attract each other (a).
- Neutron and proton will not attract each other based on charge (b).
- Electron and electron repel each other (c).
- Neutron and neutron do not attract each other based on charge (d).