Atoms, Elements, and the Periodic Table

Front

What is an atom?

Back

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

Front

What is an element?

Back

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

Front

What is the periodic table?

Back

The periodic table is a chart that organizes all known elements by their atomic number.

Front

What is the atomic number?

Back

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

Front

What are valence electrons?

Back

Valence electrons are the electrons in the outermost shell of an atom that determine its chemical properties.

Front

What is a group in the periodic table?

Back

A group is a column in the periodic table where elements have similar properties and the same number of valence electrons.

Front

What is a period in the periodic table?

Back

A period is a row in the periodic table that indicates the number of electron shells an atom has.

Front

What is the most reactive nonmetal?

Back

Fluorine is the most reactive nonmetal.

Front

What do elements in the same group have in common?

Back

Elements in the same group have the same number of valence electrons.

Front

What is a compound?

Back

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