Question

15 the orbital diagram for a ground state oxygen atom is: * (0.5 points) a. ↑↓ ↑↓ ↑ ↑ ↑ b. ↑↓ ↑↓ ↑↓ ↑↓ - c. ↑↓ ↑↓ ↑↓ ↑ - d. ↑↓ ↑↓ ↑↓ ↑ ↑ e. ↑↓ ↑↓ ↑↓ ↑↓ ↑ a b c d e

Explanation:

Step1: Recall oxygen's atomic number

Oxygen has atomic number 8, so it has 8 electrons.

Step2: Fill orbitals according to rules

Electrons fill orbitals following the Aufbau principle (low - energy orbitals first), Pauli exclusion principle (max 2 electrons per orbital with opposite spins), and Hund's rule (electrons occupy degenerate orbitals singly before pairing). First, 2 electrons go in 1s (paired with opposite spins), then 2 in 2s (paired), and then 4 in 2p. In 2p, the first 3 electrons occupy the 3 degenerate 2p orbitals singly with the same spin, and the 4th pairs up with one of them.

Answer:

D. 1s: $\uparrow\downarrow$, 2s: $\uparrow\downarrow$, 2p: $\uparrow\downarrow$ $\uparrow$ $\uparrow$