Atoms and Elements

Front

What is the atomic mass of an element?

Back

The atomic mass of an element is the weighted average mass of the atoms in a naturally occurring sample of the element, typically measured in atomic mass units (amu).

Front

What are the three main subatomic particles of an atom?

Back

The three main subatomic particles of an atom are protons, neutrons, and electrons.

Front

What is the charge of an electron?

Back

An electron has a negative charge.

Front

What is the charge of a proton?

Back

A proton has a positive charge.

Front

What is the charge of a neutron?

Back

A neutron has no charge (it is neutral).

Front

What is the nucleus of an atom?

Back

The nucleus is the central part of an atom, containing protons and neutrons.

Front

What is an 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 chemical symbol?

Back

A chemical symbol is a one or two-letter notation used to represent a chemical element.

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 an isotope?

Back

An isotope is a variant of a chemical element that has the same number of protons but a different number of neutrons.