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Front

What is Helium?

Back

Helium is an element, a colorless, odorless gas that is lighter than air.

Front

What is an Atom?

Back

An atom is the smallest unit of matter that cannot be broken into any smaller pieces.

Front

What is NaCl commonly known as?

Back

NaCl is commonly known as table salt.

Front

Is CO2 an element?

Back

No, CO2 (carbon dioxide) is a compound made of carbon and oxygen.

Front

What defines an element?

Back

An element is made up of the same type of atoms.

Front

What is a molecule?

Back

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

Front

What is a chemical bond?

Back

A chemical bond is the force that holds atoms together in a molecule.

Front

What is the difference between an element and a compound?

Back

An element consists of only one type of atom, while a compound consists of two or more different types of atoms.

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 periodic table?

Back

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