Atoms & Elements

Front

What is an atom?

Back

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

Front

What are the three main subatomic particles in an atom?

Back

Protons, neutrons, and electrons.

Front

What charge does a proton have?

Back

A proton has a positive charge.

Front

What charge does an electron have?

Back

An electron has a negative charge.

Front

What charge does a neutron have?

Back

A neutron has no charge (neutral).

Front

What is the atomic number of an element?

Back

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

Front

What does the atomic mass of an element represent?

Back

The atomic mass represents the average mass of an atom of an element, accounting for isotopes.

Front

How are elements arranged in the periodic table?

Back

Elements are arranged by increasing atomic number.

Front

What is a chemical symbol?

Back

A chemical symbol is a one or two-letter abbreviation for an element, such as H for hydrogen.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.