Question

While passing through the applied magnetic field, which of the following undergoes the maximum deflection?

• A. Stream of \(\alpha\)-particles
• B. Stream of \(\beta\)-particles
• C. \(\gamma\)-rays
• D. Stream of neutrons

Hint:

In electric and magnetic fields: \[ \beta\text{-particles} \] show the maximum deflection because they have a very small mass and a finite charge. \(\gamma\)-rays and neutrons are neutral and hence remain undeflected.

Answer 1

The Correct Option is B

Step 1: Apply Hund's rule and exchange formula.
d⁵ configuration has 5 unpaired electrons with parallel spins in 5 separate orbitals. Number of possible exchange pairs = n(n–1)/2 where n is number of parallel-spin electrons.

Step 2: Compute exchanges.
n = 5 → exchanges = 5×4/2 = 10.

Step 3: Final Answer:
10.