Unit 1: Quantum Mechanics - Atoms and Periodicity

Question 1

Who discovered the electron and how

Answer 1

JJ Thomson, cathode ray tube

Question 2

Cathode Ray Tube Experiment

Answer 2

ray of negatively charged particles (electron) curved towards positive charge

Question 3

Who discovered the protons and how

Answer 3

Rutherford, gold foil experiment

Question 4

Gold Foil Experiment

Answer 4

positively charged alpha particles go right through gold foil, some deflect off of positive nuclei back to the source

Question 5

Who discovered the neutron

Answer 5

Chadwick

Question 6

Contribution of Max Planck

Answer 6

Electron energies are quantized

Question 7

Contribution of Niels Bohr

Answer 7

Invented the Bohr atom model

Question 8

Bohr atom model (3 points)

Answer 8

Electrons orbit around the nucleus at fixed energy levels; the farther they are from the nucleus, they more energy they have; moving to a lower level emits light, moving to a higher level absorbs light

Question 9

Electromagnetic Radiation (EMR)

Answer 9

radiation including everything from radio waves to gamma rays, include electric and magnetic waves

Question 10

Wavelength (λ)

Answer 10

distance between two peaks or troughs

Question 11

Frequency (v) (Hz)

Answer 11

number of wave cycles that pass a specific space in a specific time

Question 12

Relation between wavelength and frequency

Answer 12

Inverse relationship through the speed of light

Question 13

Speed of Light constant

Answer 13

3 x 10^8 m/s

Question 14

Relationship between frequency and energy

Answer 14

Direct proportional relationship

Question 15

Proof of EMR

Answer 15

Double slit experiment

Question 16

Destructive interference

Answer 16

Two wavelengths are desynchronized and subtract from each other

Question 17

Constructive interference

Answer 17

Two wavelengths are synchronized and add to each other

Question 18

Change in energy formula

Answer 18

Planck’s constant * frequency