Periodic Table

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded. Examples include air, salad, and muddy water.

Front

What is a compound?

Back

A compound is a substance formed when two or more elements are chemically bonded together. An example is sugar (C12H22O11).

Front

What does the atomic number represent on the periodic table?

Back

The atomic number represents the number of protons in the nucleus of an atom and determines the element's identity.

Front

What is the atomic mass?

Back

The atomic mass is the weighted average mass of an element's isotopes, usually found at the bottom of each square on the periodic table.

Front

What is a heterogeneous mixture?

Back

A heterogeneous mixture is a mixture in which the components are not uniformly distributed, such as muddy water.

Front

What is a homogeneous mixture?

Back

A homogeneous mixture is a mixture in which the components are uniformly distributed, such as saltwater.

Front

What are alkali metals?

Back

Alkali metals are elements found in Group 1 of the periodic table, known for being highly reactive and having one electron in their outer shell.

Front

What are alkaline-earth metals?

Back

Alkaline-earth metals are elements found in Group 2 of the periodic table, known for having two electrons in their outer shell and being less reactive than alkali metals.

Front

What are noble gases?

Back

Noble gases are elements found in Group 18 of the periodic table, known for being inert and having a full outer shell of electrons.

Front

What are halogens?

Back

Halogens are elements found in Group 17 of the periodic table, known for being highly reactive and having seven electrons in their outer shell.