Electron Structure (OCR A-Level Chemistry A): Flashcards

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Electron structure
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Formula for max electrons in shell nn

2n22n^2

Shape of s-orbital

Spherical

Shape of p-orbital

Dumbbell (two lobes)

Max electrons in one orbital

2 (with opposite spins)

Number of p-orbitals from shell n=2n=2 onwards

Three

Total electrons three p-orbitals can hold

6

Which fills first: 4s or 3d?

4s fills before 3d

Which empties first when forming ions: 4s or 3d?

4s empties first

Hund's rule

Orbitals of same energy occupied singly before pairing

Number of d-orbitals from shell n=3n=3 onwards

Five

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