Which of the following statements is true? An atom consists of protons, electrons, and
neutrons.
An atom consists of protons and neutrons.
An atom consists of electrons bonded to one
another.
An atom consists of protons bonded to one
another.

An atom consists of protons, electrons, and neutrons.

Explanation:

The atom of an element is its smallest indivisible particle that retains its chemical properties. Atom is the fundamental and basic unit of matter.

The structure of an atom is made up of a positively charged PROTON, a neutrally charged NEUTRON (both contained in the nucleus) and a negatively charged ELECTRON that surrounds the nucleus. These three particles are called sub-atomic particles. The arrangement and number of these sub-atomic particles determine the properties of the atom.

First Question, A, An atom consists of protons, electrons, and neutrons.

Second Question, B, A nucleus consists of protons and neutrons.

edge

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.