An atom is a type of subatomic particle that cannot exist independently.

An atom is the smallest unit of an element that retains its chemical properties.

An atom is the largest unit of matter in the universe.

An atom is a molecule made up of two or more elements.

A molecule is a type of chemical reaction.

A molecule is a mixture of different substances.

A molecule is a group of atoms bonded together.

A molecule is a single atom.

Atoms combine to form molecules.

Molecules cannot exist without atoms.

Atoms are larger than molecules.

Molecules are made up of protons and neutrons.

Neutrons, electrons, and quarks

Protons, electrons, and positrons

Photons, neutrons, and muons

Protons, neutrons, and electrons

0 elementary charge

-1 elementary charge

+2 elementary charge

+1 elementary charge

Elements can be broken down into simpler substances, whereas compounds cannot.

An element can be made of multiple types of atoms, while a compound is made of a single type of atom.

A compound is a pure substance, while an element is a mixture of different substances.

An element consists of one type of atom, while a compound consists of two or more different types of atoms chemically bonded.

Protons can be counted by measuring the mass of the atom.

The number of protons is equal to the number of neutrons.

The number of protons is determined by the number of electrons.

The number of protons in an atom is equal to its atomic number.

The atomic number indicates the mass of an element.

The atomic number determines the color of an element.

The atomic number is significant because it defines the element and its chemical properties.

The atomic number is used to measure the temperature of an element.

Isotopes are variants of an element with the same number of protons but different numbers of neutrons.

Isotopes are elements with different numbers of protons.

Isotopes are always radioactive forms of an element.

Isotopes have the same number of neutrons but different numbers of electrons.