Chemistry - Topic 2.3 Electron configuration

What is the equation for the maximum number of electrons on a energy level?

2n²

How is emission spectra created?

Electrons gain energy and move to a higher energy level. The electron becomes unstable and emits a photon of a light as it falls back down.

What is “n” in terms of the emission spectra?

The principle quantum number

In which spectra is infrared light emitted?

∞ → n=3

In which spectra is visible light emitted?

∞ → n=2

In which spectra is UV light emitted?

∞ → n=1

As “n” gets smaller does the wavelength shorten or lengthen?

Shorten

As “n” gets smaller does the frequency get higher or lower?

Higher

How many orbitals are in the s subshell?

1

How many orbitals are in the p subshells?

3

How many orbitals are in the d subshell?

5

How many electrons are in the s subshell?

2

How many electrons are in the p subshell?

6

How many electrons are in the d subshell?

10

What is Aufbau’s principle?

Aufbau’s principle dictates the order which electrons fill energy orbitals “electrons arrange themselves to have the lowest energy possible”

What is Pauli’s exclusion?

Only 2 electrons can fill one orbital and must spin in opposite directions

What is Hund’s rule?

Electrons fill orbitals singly before forming pairs

Write the spdf notation for oxygen?

1s²2s²2p⁴ All the “top” numbers add up to the number or electrons.

What are the two exceptions from spdf notation?

Chromium and Copper

What is the electron configuration for chromium?

[Ar] 4s¹3d⁵

What is the electron configuration for copper?

{Ar] 4s¹3d¹⁰