Atomic & Mass Number

Front

What is the atomic number?

Back

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

Front

If an atom has 10 electrons, how many protons does it have?

Back

10 protons.

Front

What is the mass number defined as?

Back

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

Front

What are isotopes?

Back

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

Front

What is the atomic number of Nickel?

Back

28.

Front

How do you calculate the mass number of an atom?

Back

Mass number = Number of protons + Number of neutrons.

Front

What is the relationship between protons and electrons in a neutral atom?

Back

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

Front

What is a neutron?

Back

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

Front

What is a proton?

Back

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

Front

What is the difference between an atom and an ion?

Back

An atom is neutral, while an ion has a net electric charge due to the loss or gain of electrons.