Atoms, Elements and Water

Front

Why does ice float?

Back

As water freezes, it expands and its density decreases.

Front

What property of water allows it to be such a versatile solvent that it is often called the 'universal solvent'?

Back

Polarity and cohesion.

Front

A particle that moves around the nucleus is a(n)...

Back

Electron.

Front

Particles in an atom that are neutral and have no charge are...

Back

Neutrons.

Front

What is the number of protons that the element in this image contain?

Back

7.

Front

What is an atom?

Back

The basic unit of a chemical element, consisting of a nucleus surrounded by electrons.

Front

What is an element?

Back

A pure substance that cannot be broken down into simpler substances by chemical means.

Front

What is the atomic number?

Back

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

Front

What is the role of electrons in an atom?

Back

Electrons are negatively charged particles that orbit the nucleus and are involved in chemical bonding.

Front

What is the difference between an atom and a molecule?

Back

An atom is a single unit of an element, while a molecule is a group of two or more atoms bonded together.