Lesson 1 Exit Slip: Atomic Theory

What does the Bohr model suggest?

• Atoms are small, hard, indivisible objects. 
• That protons in the nucleus are attracted to electrons in the electron clouds. 
• That electrons travel around the nucleus of an atom in orbits or definite paths.

Which model suggested that: Atoms mostly consist of positively charged material with negatively charged particles (electrons) located throughout the positive material.

• Bohrs Model
• Plum Pudding Model 
• Democritus Model
• Our current model 

Explain how the Rutherford gold foil experiment correctly advanced atomic theory away from the plum pudding mode

• it proved the atom contained positive AND negative charges.

• It proved the positive charge is concentrated in a relatively small region of the atom.

• It proved the atom contains protons, electrons, and neutrons.

• It proved that atoms are spherical in shape and not shaped like pudding

In a famous experiment conducted by Ernest Rutherford, positively charged alpha particles were scattered by a thin gold foil. Which of the following is a conclusion that resulted from this experiment?

• The nucleus is negatively charged

• The atom is a dense solid and is indivisible

• The mass is conserved when atoms react chemically

• The nucleus is very small and the atom is mostly empty space

What can you conclude from the fact that scientists continue to update the atomic model?

• New information about atoms continues to be discovered
• Old information about atoms is completely useless
• Scientists did not have any information about atoms until a few years ago
• Scientists still have no idea what atoms look like