Atomic Structure

Question 1

Hunds Rule

Answer 1

Electrons will fill up empty orbitals if they are available

Question 2

Aufbau Principle

Answer 2

Electrons fill up shells and sub shells in order of increasing energy

Question 3

Dalton

Answer 3

• Was the first person to say that there were different type of atoms called elements
• Knew that atoms combined to form compounds in the same ratio
• Atoms are not created nor destroyed

Question 4

Robert Milkman

Answer 4

Calculated the charge of electrons by observing charged oil drops in an electrical field

Question 5

Neils Bohr

Answer 5

Said that electrons rotate the nucleus about fixed radii

Question 6

Max Planck

Answer 6

• Said that electromagnetic energy was quantized

- Came up with the quantum theory that stated energy doesn’t increase smoothly but in small specific steps

Question 7

JJ Thompson

Answer 7

• Observed deflections in cathode ray

- Found that there were positive and negative charges in an atom and believed in the plum pudding model

Question 8

Henry Rutherford

Answer 8

• Shot alpha particles at a gold foil and found that they bounce back
• Found that there was all the positive charges were in the middle in the nucleus, and they were surrounded by small negative particles

Question 9

Pauli Exclusion Principle

Answer 9

States that no two electrons in the same atom can have the same quantum numbers

Question 10

Heisenberg Uncertainty Principle

Answer 10

One cannot know both the momentum and the position at a particular instant

Question 11

Diamagnetic

Answer 11

When all electron spins are paired

Question 12

Paramagnetic

Answer 12

When all electron spins are not paired

Question 13

Energy of an Electron Formula

Answer 13

ΔE= -2.178E-18/n^2

Question 14

Energy and Electromagnetic Radiation Formula

Answer 14

ΔE=hv=hc/λ

Question 15

De Broglie Equation

Answer 15

λ=h/mv