elements & compounds, atoms, chemical formulas

Front

What is an atom?

Back

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

Front

What is a molecule?

Back

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

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements are chemically bonded together.

Front

What is the chemical formula for water?

Back

The chemical formula for water is H₂O.

Front

What does the subscript in a chemical formula indicate?

Back

The subscript indicates the number of atoms of the element in the molecule.

Front

What is the atomic number?

Back

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

Front

What is the difference between an element and a compound?

Back

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

Front

What is the chemical symbol for carbon?

Back

The chemical symbol for carbon is C.

Front

Which particle has a positive charge?

Back

The proton has a positive charge.

Front

What is the mass of an electron compared to a proton?

Back

An electron has a much smaller mass than a proton.