Elements and Compounds

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. It consists of only one type of atom.

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 atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is the symbol for the element with atomic number 12?

Back

Mg (Magnesium)

Front

What is the chemical formula for water?

Back

H2O

Front

How many hydrogen atoms are in one molecule of water?

Back

2

Front

How many oxygen atoms are in one molecule of carbon dioxide (CO₂)?

Back

2

Front

What is the chemical formula for carbon dioxide?

Back

CO2

Front

What is the difference between an element and a compound?

Back

Compounds are made up of two or more different elements, while elements are made up of only one type of atom.

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together, which can be of the same or different elements.