Question

"It is impossible to determine simultaneously the exact position and exact momentum of an electron." This statement is called

• A. Pauli's exclusion principle
• B. Hund's rule
• C. Aufbau rule
• D. Heisenberg uncertainty principle

Hint:

Because of Heisenberg's Uncertainty Principle, Bohr's old concept of electrons traveling in well-defined, exact circular "orbits" had to be completely discarded and replaced with the concept of probability "orbitals"!

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Quantum mechanics dictates that subatomic particles behave differently than macroscopic objects.

Step 2: Formula Application:
Mathematical form: $\Delta x \cdot \Delta p \ge \frac{h}{4\pi}$

Step 3: Explanation:
Werner Heisenberg proposed that the more precisely you know a particle's position ($\Delta x$), the less precisely you can know its momentum ($\Delta p$), and vice versa. This is a fundamental limit of nature, not a measurement error.

Step 4: Final Answer:
The statement is the Heisenberg uncertainty principle.