Protons, Neutrons, and Electrons

Front

What are protons?

Back

Protons are positively charged particles found in the nucleus of an atom. They determine the atomic number of an element.

Front

What are neutrons?

Back

Neutrons are neutral particles found in the nucleus of an atom. They contribute to the atomic mass but do not affect the charge of the atom.

Front

What are electrons?

Back

Electrons are negatively charged particles that orbit the nucleus of an atom. They are involved in chemical bonding and reactions.

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 do you find the number of neutrons in an atom?

Back

To find the number of neutrons, subtract the atomic number from the atomic mass of the element.

Front

What is the atomic mass?

Back

The atomic mass is the weighted average mass of an atom's isotopes, measured in atomic mass units (amu).

Front

Who proposed the Plum Pudding Model of the atom?

Back

J.J. Thomson proposed the Plum Pudding Model, which depicted the atom as a sphere of positive charge with negatively charged electrons embedded within.

Front

What is the charge of a proton?

Back

The charge of a proton is +1.

Front

What is the charge of a neutron?

Back

Neutrons have no charge; they are neutral.

Front

What is the charge of an electron?

Back

The charge of an electron is -1.