Question

practice 1
what is true about the atom? select all that are correct.
is made up of protons, neutrons and electrons
make up the matter in the universe
are found in nonliving matter only
is found only on earth
is about the same size as a cell
smallest unit of matter that keeps its chemical properties

Explanation:

1. "Is made up of protons, neutrons and electrons": Atoms have a nucleus (protons + neutrons) and electrons orbiting, so this is correct.
2. "Make up the matter in the universe": All matter is composed of atoms, so this is correct.
3. "Are found in nonliving matter only": Atoms are in living (e.g., cells) and non - living matter, so this is incorrect.
4. "Is found only on Earth": Atoms exist throughout the universe (stars, planets, etc.), so this is incorrect.
5. "Is about the same size as a cell": Atoms are much smaller than cells, so this is incorrect.
6. "Smallest unit of matter that keeps its chemical properties": By definition, an atom is the smallest unit of an element that retains its chemical properties, so this is correct.

Answer:

• Is made up of protons, neutrons and electrons
• Make up the matter in the universe
• Smallest unit of matter that keeps its chemical properties