Question

which argument best explains the charge of an atomic nucleus?
an atomic nucleus is positively charged because it is composed of neutrons.
an atomic nucleus is positively charged because it is composed of protons.
an atomic nucleus is negatively charged because it is composed of electrons.
an atomic nucleus is negatively charged because it is composed of neutrons.

Explanation:

To determine the correct argument, we analyze the components of an atomic nucleus and their charges:

1. Neutrons have no charge (neutral), so options involving neutrons explaining a charged nucleus (positive or negative) are incorrect.
2. Electrons are not part of the atomic nucleus (they orbit the nucleus), so options involving electrons in the nucleus are incorrect.
3. Protons have a positive charge, and the atomic nucleus is composed of protons and neutrons (neutrons are neutral). Thus, the positive charge of the nucleus comes from the protons.

Answer:

B. An atomic nucleus is positively charged because it is composed of protons.