Electron Arrangement

What are electrons arranged in?

Energy levels (shells) and subshells (s and p only)

How many orbitals are in:

• s subshell?

• p subshell?

• d subshell?

• f subshell?

• s = 1 orbital

• p = 3 orbitals

• d = 5 orbitals

• f = 7 orbitals

How many electrons can:

• an orbital hold?

• s subshell hold?

• p subshell hold?

• d subshell hold?

• f subshell hold?

• Orbital = 2 electrons

• s = 2 electrons

• p = 6 electrons

• d = 10 electrons

• f = 14 electrons

What is an orbital?

A region that can hold up to 2 electrons with opposite spins

What must electrons in the same orbital have?

Opposite spins

What does Hund’s rule state?

Electrons fill orbitals singly before pairing

How do you write electron configuration?

Using subshell notation (e.g. 1s² 2s² 2p⁶)

Electron configuration of oxygen (8 electrons)?

1s² 2s² 2p⁴