Question

question: which of the following are present in the nucleus of an atom? answer options: select one of four protons and neutrons electrons only protons and electrons neutrons only

Explanation:

To determine what is in an atom's nucleus, we recall atomic structure: the nucleus contains protons (positively charged) and neutrons (neutral), while electrons orbit the nucleus. So we analyze each option:

• "Protons and neutrons": Matches the nucleus composition.
• "Electrons only": Electrons are outside the nucleus. Eliminate.
• "Protons and electrons": Electrons are not in the nucleus. Eliminate.
• "Neutrons only": Nucleus also has protons (except in hydrogen - 1). Eliminate.

Answer:

A. Protons and neutrons