Explanation

• Paschen, Brackett, Pfund, Humphreys = Infrared

Additional information:

• Lyman series = Ultraviolet
• Balmer series = Visible

Last verified on 29-10-2026

Explanation

Formula: En = -1312 / n^2 kJ/mole

For n=2: E2 = -1312 / 4 = -328.25 kJ/mole

Last verified on 29-10-2026

Explanation

Formula: Bond order = (Nb - Na) / 2

For O2:

Total electrons = 16

Configuration: σ1s² σ_1s² σ2s² σ_2s² σ2pz² π2px² π2py² π_2px¹ π_2py¹

Bonding electrons (Nb) = 10

Antibonding electrons (Na) = 6

Bond order = (10 - 6) / 2 = 4/2 = 2

Means O=O double bond, which also explains its 2 unpaired electrons (paramagnetic).

Last verified on 29-10-2026

Explanation

• Degenerate orbitals are orbitals that have the same energy.
• The three p orbitals (px, py, pz) in an isolated atom have the same energy.
• They have different directions but equal energy.

Last verified on 29-10-2026

Explanation

1. 1st line (H-alpha) = electron from n=3 to n=2 : n1=2, n2=3
2. 2nd line (H-beta) = electron from n=4 to n=2 : n1=2, n2=4
3. 3rd line (H-gamma) = electron from n=5 to n=2 : n1=2, n2=5