Front

What are valence electrons?

Back

Valence electrons are the electrons in the outermost shell of an atom that are involved in chemical bonding.

Front

How many valence electrons does Sodium have?

Back

Sodium has 1 valence electron.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that can be separated by physical means.

Front

What is a pure substance?

Back

A pure substance is a material that has a constant composition and consistent properties throughout.

Front

What is the difference between elements and compounds?

Back

Elements are pure substances that cannot be broken down into simpler substances, while compounds are made up of two or more elements chemically bonded together.

Front

What does the atomic number represent?

Back

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

Front

How many protons does an atom of Phosphorus have?

Back

Phosphorus has 15 protons.

Front

What is the mass number of an atom?

Back

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

Front

How many neutrons are in Phosphorus?

Back

Phosphorus has 16 neutrons.

Front

What is a compound?

Back

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