Atoms Labster Theory Flashcards

Vocabulary terms and definitions regarding the basic structure, properties, and components of atoms based on the Labster theory page.

Atom

The smallest unit of matter that has the properties of a chemical element.

Size of an atom

Around $100\,\text{picometers}$.

Atomos

The Greek word meaning "uncuttable" ($\text{a} = \text{not}$, $\text{tomos} = \text{cut}$) from which the word "Atom" is derived.

Subatomic particles

The three components of an atom: neutrons, protons, and electrons.

Neutrons

Subatomic particles that are neutrally charged and exist in the nucleus.

Protons

Subatomic particles that are positively charged and exist in the nucleus.

Electrons

Subatomic particles that are negatively charged and orbit around the nucleus.

Nucleus

A small dense area in the center of the atom containing neutrons and protons.

Atomic Number

A value representing the number of protons in an atom.

Mass Number

A value reflecting the sum of both neutrons and protons in an atom.

Ions

Charged atoms where the number of protons and electrons are different.