Atoms, molecules, and compounds practice

Front

What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element. It consists of protons, neutrons, and electrons.

Front

What is a molecule?

Back

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

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?

Back

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

Front

How many protons does sodium (Na) have?

Back

Sodium has 11 protons, as its atomic number is 11.

Front

What is the chemical formula for water?

Back

Front

Back

Front

What is the total number of atoms in an ammonia (NH₃) molecule?

Back

An ammonia molecule (NH₃) contains a total of 4 atoms: 1 nitrogen (N) and 3 hydrogen (H) atoms.

Front

What is the difference between a molecule and a compound?

Back

A molecule can consist of the same or different types of atoms, while a compound specifically consists of different types of atoms.

Front

Back