Atomic Number, Atomic Mass, Protons, Neutrons, Electrons

Front

What is the atomic number of an atom?

Back

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

Front

How is atomic mass calculated?

Back

Atomic mass is calculated by adding the number of protons and neutrons in an atom's nucleus.

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 charge of an electron?

Back

An electron has a negative charge.

Front

How many protons are in an atom with an atomic number of 15?

Back

There are 15 protons in an atom with an atomic number of 15.

Front

If an atom has 12 protons and 12 electrons, what is its overall charge?

Back

The overall charge is neutral because the number of protons equals the number of electrons.

Front

What is the relationship between protons and electrons in a neutral atom?

Back

In a neutral atom, the number of protons equals the number of electrons.

Front

What is the mass of an atom with 6 protons and 6 neutrons?

Back

The mass of the atom is 12 (6 protons + 6 neutrons).

Front

What subatomic particle determines the chemical properties of an element?

Back

Electrons determine the chemical properties of an element.