Atomic Structure and Theory

Front

What is the atomic number of an element?

Back

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

Front

What are protons?

Back

Protons are positively charged subatomic particles found in the nucleus of an atom.

Front

What are neutrons?

Back

Neutrons are neutral subatomic particles found in the nucleus of an atom.

Front

What are electrons?

Back

Electrons are negatively charged subatomic particles that orbit the nucleus of an atom.

Front

What is the mass number of an atom?

Back

The mass number is the total number of protons and neutrons in the nucleus of an atom.

Front

What are isotopes?

Back

Isotopes are variants of the same element that have the same number of protons but different numbers of neutrons.

Front

What is the standard unit of atomic mass?

Back

The standard unit of atomic mass is the atomic mass unit (amu).

Front

How do you calculate the number of neutrons in an atom?

Back

To calculate the number of neutrons, subtract the atomic number from the mass number.

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 the charge of a proton?

Back

A proton has a positive charge.