Atomic Structure & History

Front

How many electron shells/levels does an atom have?

Back

An atom can have multiple electron shells, with the number depending on the element. For example, Lithium has 3 electron shells.

Front

What is the total number of protons and neutrons in one atom of Lithium?

Back

The total number of protons and neutrons in one atom of Lithium is 7.

Front

What are the particles in an atom that are neutral and have no charge?

Back

The particles in an atom that are neutral and have no charge are called neutrons.

Front

What is the central region of an atom where neutrons and protons are located?

Back

The central region of an atom where neutrons and protons are located is called the nucleus.

Front

What is the number of protons in an atom of Lithium?

Back

An atom of Lithium contains 3 protons.

Front

Define an electron shell.

Back

An electron shell is a region around the nucleus of an atom where electrons are likely to be found.

Front

What is the charge of a proton?

Back

A proton has a positive charge.

Front

What is the charge of an electron?

Back

An electron has a negative charge.

Front

What is the atomic number of an element?

Back

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

Front

What is the mass number of an atom?

Back

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