atomic number and mass number

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 element?

Back

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

Front

Which subatomic particle has a positive charge?

Back

Proton.

Front

Which subatomic particle has no charge?

Back

Neutron.

Front

What is the charge of an electron?

Back

Negative.

Front

How do isotopes of an element differ?

Back

Isotopes of an element have the same number of protons but different numbers of neutrons.

Front

What is the relationship between atomic number and the number of electrons in a neutral atom?

Back

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

Front

How many protons are in a carbon atom?

Back

Carbon has 6 protons.

Front

How many neutrons are in C-14?

Back

C-14 has 8 neutrons.

Front

What does the term 'isotope' mean?

Back

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