Atomic Number and Atomic Mass

Front

What is the atomic number?

Back

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

Front

Which particle has a positive charge?

Back

The proton has a positive charge.

Front

What is the atomic number of the fluorine atom?

Back

The atomic number of the fluorine atom is 9.

Front

What is the mass number defined as?

Back

The mass number is defined as the number of protons and neutrons in an atom.

Front

What is the mass number of an atom with 3 protons and 4 neutrons?

Back

The mass number is 7.

Front

What is the charge of a neutron?

Back

A neutron has no charge (it is neutral).

Front

How do you calculate the mass number?

Back

Mass number = Number of protons + Number 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 atomic number equals the number of electrons.

Front

What is the significance of the atomic number in the periodic table?

Back

The atomic number determines the position of an element in the periodic table.

Front

What is an isotope?

Back

Isotopes are atoms of the same element with different numbers of neutrons.