MATCH THE COLUMN
`{:(,"Column-I",,"Column-II",),((A),"Aufbau principal",(p),"Line spectrum in visible region",),((B),"de broglie",(q),"Orientation of an electron in an orbital",),((C),"Angular momentum",(r ),"Photon",),((D),"Hund's rule",(s),lambda = h//mv,),((E),"Balmer series",(t),"Electron configuration",),((F),"Planck's law",(u),mvr,):}`

Answer

To solve the matching question, we will analyze each term in Column-I and find the corresponding term in Column-II.

### Step-by-Step Solution:

1. **Aufbau Principle (A)**:
- The Aufbau principle states that electrons fill orbitals starting from the lowest energy level to the highest. This relates to the arrangement of electrons in an atom.
- **Match**: T (Electron configuration)

2. **De Broglie (B)**:
- Louis de Broglie proposed that particles, such as electrons, exhibit wave-like behavior. The formula associated with this is λ = h/mv, where λ is the wavelength, h is Planck's constant, m is mass, and v is velocity.
- **Match**: s (λ = h/mv)

3. **Angular Momentum (C)**:
- Angular momentum in the context of electrons is given by the formula mvr, where m is mass, v is velocity, and r is the radius of the orbit.
- **Match**: u (mvr)

4. **Hund's Rule (D)**:
- Hund's rule states that electrons will occupy degenerate orbitals singly before pairing up. This relates to the orientation of electrons in orbitals.
- **Match**: q (Orientation of an electron in an orbital)

5. **Balmer Series (E)**:
- The Balmer series refers to the spectral lines of hydrogen in the visible region. It is a specific set of wavelengths emitted by hydrogen.
- **Match**: p (Line spectrum in visible region)

6. **Planck's Law (F)**:
- Planck's law relates to the quantization of energy and describes how energy is emitted in the form of photons.
- **Match**: r (Photon)

### Final Matches:
- A → T (Aufbau principle → Electron configuration)
- B → S (De Broglie → λ = h/mv)
- C → U (Angular momentum → mvr)
- D → Q (Hund's rule → Orientation of an electron in an orbital)
- E → P (Balmer series → Line spectrum in visible region)
- F → R (Planck's law → Photon)

### Summary of Matches:
- A - T
- B - S
- C - U
- D - Q
- E - P
- F - R