History of Atomic Theory

The word 'atomos' termed by Democritus means:

• Indivisible
• Unconscious
• Blue
• Nuclear powered

Which of these is part of Dalton's atomic theory?

• Every element is identical on the atomic level

• Atoms are made of elements

• Two atoms of the same element are identical

• Atoms never interact with other atoms

Tags

NGSS.HS-PS1-7

In the chocolate chip cookie model, the "DOUGH" was thought to have a(n)…

• Average charge of 5

• Negative charge

• Positive charge

• Neutral charge

Tags

NGSS.HS-PS1-3

The Gold Foil experiment FIRST led to the discovery of the…

• Atom
• Electron
• Neutron
• Nucleus

What was the charge of the alpha particles in the Gold Foil experiment?

• Neutral
• Positive
• Unknown
• Negative

How did the Gold Foil experiment DISPROVE the chocolate chip cookie model of the atom? (2 answers)

• The chocolate chip cookie model didn't account for a nucleus in the center; the α-particles bounced off this nucleus

• The α-particles bounced off the electrons in the center of the atom

• The α-particles that got close enough to the nucleus were curved/deflected

• The α-particles turned into energy and cooked the cookie which is delicious

• The electrons were too small to deflect the α-particle

What's the difference between these two atomic models?

• The Bohr model has specific paths for the electrons, whereas the Rutherford model just has electrons wherever

• The Bohr model has a nucleus and the Rutherford model doesn't

• The Rutherford model has electrons because Rutherford discovered the electron

• Rutherford's model is slightly smaller because Bohr felt like he deserved it

The Bohr model is the first atomic model to describe electron shells. What does this mean?

• Calcium carbonate exoskeletons to protect the electrons from predators

• Special places the electron can be without the nucleus interfering

• Levels and paths that the electrons travel around when they orbit the nucleus

• Quantum spin probabilities which account for electron momentum

Which is NOT a feature of the Bohr model?

• Nucleus in the middle

• Electrons on specific paths

• Electrons orbiting the nucleus

• Neutrons in the nucleus

• More than 1 electron

The Heisenburg Uncertainty Principal states that if you know the _______, you do not know the momentum of an electron

• Positive charge value

• Position

• Vector path

• Speed