Question

question 25
the observation that no two electrons in the same atom have the same set of four quantum numbers is known as
mendeleevs law
the quantum effect
hunds rule
pauli exclusion principle
question 26
which rule specifies that the lowest - energy configuration is the one with the maximum possible number of unpaired electrons.
the quantum effect
hunds rule
mendeleevs law
pauli exclusion principle

Explanation:

For Question 25: The Pauli exclusion principle states that no two electrons in the same atom can have the same set of four quantum numbers. For Question 26: Hund's rule specifies that the lowest - energy configuration is the one with the maximum possible number of unpaired electrons.

Answer:

Question 25: D. Pauli exclusion principle
Question 26: B. Hund's rule