Atomic Number, Mass Number and Isotopes

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 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

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

Back

Number of neutrons = Mass number - Atomic number.

Front

What are isotopes?

Back

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

Front

What is the relationship between isotopes and atomic mass?

Back

Isotopes can have different atomic masses due to the varying number of neutrons.

Front

How many neutrons are in Carbon-14 (C-14)?

Back

8 neutrons.

Front

What is true about all atoms of the same element?

Back

All atoms of the same element have the same number of protons.

Front

What varies between isotopes of an element?

Back

The number of neutrons and the atomic mass vary between isotopes.

Front

What is the average atomic mass?

Back

The average atomic mass is the weighted average of the masses of an element's isotopes.

Front

How many protons does the element with atomic number 7 have?

Back

It has 7 protons.