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 atomic mass?

Back

Atomic mass is the weighted average mass of an element's isotopes, measured in atomic mass units (amu). It reflects the total number of protons and neutrons.

Front

What is 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 calculate the number of neutrons in an atom?

Back

To find the number of neutrons, subtract the atomic number from the atomic mass (rounded to the nearest whole number).

Front

What is the atomic mass of Sodium?

Back

22.99 (23 rounded)

Front

How many electrons does Calcium have?

Back

Calcium has 20 electrons.

Front

How many protons does Calcium have?

Back

Calcium has 20 protons.

Front

What is the atomic number of Argon?

Back

The atomic number of Argon is 18.