1E Practice: Atoms and Elements

Front

What is an atom?

Back

The smallest unit of matter that retains the properties of an element.

Front

What are protons?

Back

Positively charged particles found in the nucleus of an atom.

Front

What are neutrons?

Back

Neutral particles found in the nucleus of an atom, with no charge.

Front

What are electrons?

Back

Negatively charged particles that orbit the nucleus of an atom.

Front

What is the nucleus of an atom?

Back

The central part of an atom, containing protons and neutrons.

Front

What is the atomic number?

Back

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

Front

What is the mass number?

Back

The total number of protons and neutrons in an atom's nucleus.

Front

What is a neutral atom?

Back

An atom with an equal number of protons and electrons, resulting in no net charge.

Front

What is an ion?

Back

An atom that has gained or lost one or more electrons, resulting in a net charge.

Front

How do you calculate net charge?

Back

Net charge = Number of protons - Number of electrons.