Terms to Learn #4 ATOMS

Front

What is the smallest unit of matter?

Back

An atom is the smallest unit of matter, made of electrons, neutrons, and protons.

Front

What is the particle in the nucleus of an atom with no charge?

Back

A neutron is the particle in the nucleus of an atom that has no charge.

Front

What is the negatively charged particle that orbits the nucleus of an atom?

Back

An electron is the negatively charged particle that orbits the nucleus of an atom.

Front

What is a pure substance made of only one kind of atom called?

Back

An element is a pure substance made of only one kind of atom.

Front

What is the chart that organizes all known elements by their physical and chemical properties?

Back

The Periodic Table of Elements organizes all known elements by their physical and chemical properties.

Front

What are the three main particles that make up an atom?

Back

The three main particles that make up an atom are protons, neutrons, and electrons.

Front

What is the charge of a proton?

Back

A proton has a positive charge.

Front

What is the charge of an electron?

Back

An electron has a negative charge.

Front

What is the center of an atom called?

Back

The nucleus is the center of an atom.

Front

What is the atomic number?

Back

The atomic number is the number of protons in the nucleus of an atom.