Atoms, Elements, Molecules and Compounds

Front

What is an atom?

Back

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

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Each element is made up of atoms that have the same number of protons.

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.

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements chemically bond together in a fixed ratio.

Front

What distinguishes a molecule from a compound?

Back

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

Front

What is the chemical symbol for oxygen?

Back

The chemical symbol for oxygen is O.

Front

What is the chemical formula for water?

Back

The chemical formula for water is H2O, indicating it is composed of two hydrogen atoms and one oxygen atom.

Front

What is the difference between a homogeneous mixture and a compound?

Back

A homogeneous mixture contains two or more substances that are evenly distributed and can be separated by physical means, while a compound is a chemical combination of elements that cannot be separated by physical means.

Front

What is the significance of the periodic table?

Back

The periodic table organizes all known elements based on their atomic number, electron configuration, and recurring chemical properties.

Front

What is a chemical bond?

Back

A chemical bond is the force that holds atoms together in a molecule or compound, which can be ionic or covalent.