Electron Configuration
No description yet. This curated deck is ready for daily study.
Card preview (13)
What is electron configuration?
The arrangement of electrons in an atom’s orbitals.
What is the Aufbau Principle?
Electrons fill the lowest energy orbitals first before moving to higher ones
What is the Pauli Exclusion Principle?
No two electrons in the same orbital can have the same set of quantum numbers—they must have opposite spins.
What is Hund’s Rule?
Electrons occupy empty orbitals in a subshell singly before pairing up.
What is the order of orbital filling?
1s → 2s → 2p → 3s → 3p → 4s → 3d → 4p → 5s → 4d → 5p → 6s → 4f → 5d → 6p → 7s..
Which electrons are lost first in ion formation: 4s or 3d?
4s electrons are lost first
Why are 4s orbitals filled before 3d, but emptied first?
Because 4s is lower in energy when empty, but 3d becomes more stable once occupied.
What makes something a transition element?
It must form at least one ion with an incomplete d-subshell
How many electrons can each energy level hold?
✨ Energy level (n) = shell number Use the formula: 👉 Maximum electrons = 2n²
How many electrons does s sublevel hold?
s holds 2
How many electrons does p sublevel hold?
p holds 6
How many electrons does f sublevel hold?
f holds 14
How many electrons does d sublevel hold?
d holds 10