quantum numbers

20/7/25 + half of 25/5/25

principal quantum number

• energy level of electron

• n=1, 2, 3, 4…

secondary quantum number

• subshell/orbital shape

• l = n - 1

• if n = 3, l = 0, 1, 2

magnetic quantum number

• orbital/subshell orientation (shape)

• m_l = -l … 0… +l

• if l = 1, m_l = -1, 0, 1

• if l = 3, m_l = -3, -2, -1, 0, 1, 2, 3

magnetic spin number

• spin of electron

• m_s = +1/2 (clockwise spin), -1/2 (counterclockwise spin)

what are the purposes of quantum #s?

estimate location of electron

s - orbital

• l = 0

• 1 orbital: m_l = 0

• 2 electrons

• spherical

p-orbital

• l = 1

• 3 orbitals: m_l = -1, 0, 1

• 6 electrons

• dumbell

d-orbitals

• l=2

• 5 orbitals: m_l = -2, -1, 0, 1, 2

• 10 electrons

f-orbitals

• l = 3

• 7 orbitals: m_l = -3, -2, -1, 0, 1, 2, 3

• 14 electrons