Quantum Mechanics

Question 0

Regions of Probability

Answer 0

Areas where electron is most likely to be found.

-assigned a series of quantum numbers

Question 1

Why do protons stay together?

Answer 1

1. Protons are made up of smaller particles (quarks).
2. Quarks come in 6 varieties - up, down, strange, charm, top, bottom
3. We find 2 up & 1 down quark in a proton.

Question 2

Principle Quantum Number

Answer 2

N - Size

N = 1…7…∞

Question 3

Angular Quantum Number

Answer 3

ℓ - Shape

ℓ = 0…(N-1)

Question 4

Magnetic Quantum Number

Answer 4

m - Orientation

m = -ℓ…0…+ℓ

Question 5

SPIN

Answer 5

Tells about electron itself.

+1/2 or -1/2

Question 6

Aufbau Key

Answer 6

Electrons will locate in lowest energy orbital available.

Question 7

Hund’s Rule (m)

Answer 7

When there are multiple orbitals of the same energy (orientations), electrons will do into each orientation before they share.

Question 8

Pauli Exclusion Principle (spin)

Answer 8

Each orbital can hold at most 2e- with opposite spin.

Question 9

Dmitri Mendeléef

Answer 9

Developed & published 1st Periodic Table
Grouped elements based on similar chemical & physical properties.
Organized based on atomic masses.
Predicted chemical & physical properties for 4 unknown elements (later found to be correct).

Question 10

Henry Mosely

Answer 10

Calculated the # of protons (Atomic Number - Z)
Reorganized Periodic Table based on increasing Atomic Number.
Periodic Law
-When organized by atomic number, there is a natural, repeating pattern in the chemical & physical properties of the elements.

Question 11

Glenn Seaborg

Answer 11

Worked on Manhattan Nuclear Project, generating & isolating elements & isotopes.
Chemical & physical properties of 3 elements fit better on a new series of element (Actinide) rather than in the main table.