atomic number and atomic mass

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 is atomic mass?

Back

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

Front

How do you calculate the mass number of an atom?

Back

The mass number is calculated by adding the number of protons and neutrons in the nucleus.

Front

What is the charge of a proton?

Back

A proton has a positive charge.

Front

What is the charge of an electron?

Back

An electron has a negative charge.

Front

What is the charge of a neutron?

Back

A neutron has no charge (it is neutral).

Front

If an atom has 6 protons, what is its atomic number?

Back

The atomic number is 6, which identifies the element as carbon.

Front

What is an isotope?

Back

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

Front

How many neutrons are in Carbon-14?

Back

Carbon-14 has 8 neutrons (14 mass number - 6 protons = 8 neutrons).

Front

What is the most abundant isotope of nitrogen?

Back

The most abundant isotope of nitrogen is Nitrogen-14.