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principle quantum number

used to describe the energy level of an electron


principle quantum's number's symbol/ orbital quantum numbers

Orbital quantum number

used to describe shape possible at energy level (s, p, d, f)

magnetic quantum number

how many orbits/ orientations at energy level

Spin Quantum Number

tell you the spin of the election


spin quantum number's definition

2 squared

magnetic quantum number's symbol

aufbau principle

fill orbitals from lowest to highest

hund's rule

when filling orbitals with more than one orientation, start with all "up" electrons "BUS RULE"


fill order for electron configuration

s p d f

What are the four possible orbital shapes?


What is the orbital with the lowest energy level?


How many electrons are able to be in one orbital?


How many electrons are able to be in the 2nd energy level. (hint: 2n^2)

Pauli Exclusion Principle

No electrons can have the same 4 quantum numbers in a given element

Heisenberg Uncertainty Principle

there is a fundamental limit to how precisely we can know both the position and the momentum of a particle at a given time

Same number of protons

How many electrons are in a neutral atom?

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