Atoms and Molecules

Front

What is an atom?

Back

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

Front

What are protons?

Back

Protons are positively charged particles found in the nucleus of an atom.

Front

What are neutrons?

Back

Neutrons are neutral particles found in the nucleus of an atom.

Front

What are electrons?

Back

Electrons are negatively charged particles that orbit the nucleus of an atom.

Front

What is the nucleus of an atom?

Back

The nucleus is the central region of an atom, containing protons and neutrons.

Front

What is the atomic number?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element.

Front

How do you find the number of neutrons in an atom?

Back

Subtract the atomic number from the atomic mass (rounded to the nearest whole number).

Front

What is the atomic mass?

Back

The atomic mass is the weighted average mass of an atom's isotopes, measured in atomic mass units (amu).

Front

What is an element?

Back

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

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together.