Atoms and Molecules

Front

What is an ELEMENT?

Back

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

Front

What is the simplest atom?

Back

The simplest atom is Hydrogen, which has only one proton and one electron.

Front

What is the charge of an electron?

Back

An electron has a NEGATIVE charge.

Front

What is the charge of a neutron?

Back

A neutron has NO charge.

Front

How many atoms are in a molecule of water?

Back

A molecule of water is made up of 3 atoms: 2 hydrogen atoms and 1 oxygen atom.

Front

What is a molecule?

Back

A molecule is a group of two or more atoms 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

What is a proton?

Back

A proton is a subatomic particle found in the nucleus of an atom that has a POSITIVE charge.

Front

What is the difference between an atom and a molecule?

Back

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

Front

What is the role of electrons in an atom?

Back

Electrons are responsible for the chemical properties of an atom and participate in chemical bonding.