The Atom

Front

What is the atomic number?

Back

The atomic number is the number of protons in the nucleus of an atom.

Front

The particles with no charge in an atom are the _______.

Back

Neutrons are the particles with no charge in an atom.

Front

Which two particles make up the nucleus of an atom?

Back

Protons and Neutrons make up the nucleus of an atom.

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

Oxygen’s atomic number is 8. This means that an oxygen atom must have _______.

Back

An oxygen atom must have 8 protons.

Front

What is a proton?

Back

A proton is a positively charged particle found in the nucleus of an atom.

Front

What is a neutron?

Back

A neutron is a particle with no charge found in the nucleus of an atom.

Front

What is an electron?

Back

An electron is a negatively charged particle that orbits the nucleus of an atom.

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 is equal to the atomic number.

Front

What is the significance of the mass number?

Back

The mass number indicates the total number of protons and neutrons in an atom, which helps determine the isotope of an element.