atomic structure and theory

In an atom, electrons move in definite orbits around the nucleus.

• Thomson
• Rutherford
• Bohr
• Democritus

What scientist is best known for his "Plum Pudding" model of the atom?

• J.J. Thomson
• Ernest Rutherford
• John Dalton
• Democritus

Tags

NGSS.MS-PS1-1

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.

Tags

NGSS.MS-PS1-1

The first person to propose a theory about an atom called the Atomos Theory was

• Democritus
• Rutherford
• Dalton
• Aristotle

Who discovered the nucleus using the gold foil experiment?

• Democritus
• Robert Millikan
• James Chadwick
• Ernest Rutherford

He discovered the electron using cathode ray tube experiment.

• Joseph Thomson
• John Dalton
• Ernest Rutherford
• Robert Millikan

His atomic model was depicted similar to a planetary/solar system

• Niels Bohr
• Joseph Thomson
• Ernest Rutherford
• Democritus

He first measured the mass and charge of an electron using the oil drop experiment.

• Joseph Thomson
• Robert Millikan
• John Dalton
• Niels Bohr

Isotopes are elements with a different amount of

• protons
• neutrons
• electrons
• atoms

Tags

NGSS.HS-PS1-8

an element will always have the same number of 

• neutrons
• protons
• isotopes
• atoms

Tags

NGSS.MS-PS1-1