Atomic Theory Quiz

who discovered the electron

• Dalton

• J.J Thomson

• Lavoisier

• Rutherford

Subatomic particles with a positive charge

• neutrons
• atomic mass
• protons
• isotopes

Tags

NGSS.HS-PS1-8

Which two subatomic particles make up the nucleus of an atom?

• Protons and Electrons
• Neutrons and Electrons
• Electrons and Protons
• Protons and Neutrons

Tags

NGSS.HS-PS1-8

What is the mass number?

• the number of protons in the nucleus

• the number of protons and neutrons in the nucleus

• the number of neutrons in the nucleus

• the number of protons and electrons in the atom

What does the C represent?

• atomic mass
• atomic number
• element name
• chemical symbol 

Tags

NGSS.HS-PS1-1

Which of the following determines the identity of an element?

• number of protons

• atomic mass

• number of neutrons

• number of shells

Bohr discovered that electrons are located in

• the nucleus

• inside protons

• electron cloud

• circular orbits around the nucleus

Who was the Greek philosopher who called the smallest particle of matter an "atom"?

• Democritus

• Aristotle

• J.J Thompson

• Einstein

Who is the scientist who proposed the "solar system" model of an atom where the electrons orbit around the nucleus?

• Democritus
• Niels Bohr
• Ernest Rutherford
• Chadwick

Rutherford's gold foil experiment provided evidence that...

• negative and positive charges are spread evenly throughout the atom.
• alpha particles have a positive charge.
• gold is not a dense as previously thought.
• there is a dense positively charged nucleus at the center of an atom.