Front

What is a chemical formula?

Back

An expression that identifies the types and numbers of elements found in a compound.

Front

What is an ionic bond?

Back

The force of attraction between oppositely charged ions.

Front

How many neutrons does a neutral potassium atom with an atomic number of 19 and a mass number of 39 have?

Back

20

Front

What are the characteristics of the majority of actinide series elements?

Back

They are synthetic, radioactive, and difficult to study.

Front

What is a mixture?

Back

A combination of two or more substances that are not chemically combined.

Front

What is a covalent bond?

Back

A type of bond in which valence electrons are shared between atoms.

Front

What is an element?

Back

A pure substance that cannot be broken down into simpler substances by chemical means.

Front

What is a compound?

Back

A substance formed when two or more elements are chemically bonded together.

Front

What is the atomic number?

Back

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

Front

What is the mass number?

Back

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