The Atomic Structure and Atomic Theory

What is the electron cloud?

• The region around the nucleus where electrons are likely to be found.

• A solid structure that holds the nucleus together.

• A type of particle that carries a negative charge.

• The area where protons and neutrons are located.

The positively charged particles of an atom are the ________.

• Neutrons

• Electrons

• Protons

• Nuclei

Which letter represents a proton?

• A

• B

• C

• D

James Chadwick discovered the ________.

• Proton

• Electron

• Neutron

• Photon

What is an isotope?

• Atoms of the same element with different numbers of protons.

• Atoms of the same element with different numbers of neutrons.

• Atoms of different elements with the same number of neutrons.

• Atoms that have the same mass but different charges.

What is the charge of a neutron?

• Positive

• Negative

• Neutral (no charge)

• Depends on the environment

What is the charge of an electron?

• Positive

• Neutral

• Negative

• Variable

What is the atomic number of an element?

• The number of neutrons in the nucleus of an atom.

• The number of protons in the nucleus of an atom.

• The total number of electrons in an atom.

• The mass of an atom measured in atomic mass units.

The center of an atom is known as the ________.

• Nucleus

• Electron

• Proton

• Neutron

Which letter represents the nucleus?

• A

• B

• C

• D