Question

10 matching 3 points please match the electron configuration to the correct element. 2 - 8 - 3 - 1 2 - 8 - 17 - 6 2 - 8 - 18 - 8 11 categorization 1 point please place the electron configurations into the correct category, either ground state or excited state. ground state no answers chosen possible answers excited state no answers chosen

Explanation:

Step1: Recall electron - configuration rules

Electrons fill orbitals in a specific order. The first shell can hold 2 electrons, the second 8, the third 8 (initially), then 18 as we move to higher atomic numbers. The total number of electrons in an atom is equal to its atomic number.

Step2: Analyze each electron - configuration

• For 2 - 6: The total number of electrons is 8, which is the atomic number of Oxygen.
• For 2 - 18 - 8 - 1: The total number of electrons is 29, which is the atomic number of Copper.
• For 2 - 7 - 6: This is an excited - state configuration (not a valid ground - state). But if we consider the total electrons 15, it corresponds to Phosphorus in the ground - state.
• For 2 - 8 - 1 - 1: This is an excited - state configuration. The element with 12 electrons in the ground - state is Magnesium, but it's not in the options.
• For 2 - 8 - 3 - 1: This is an excited - state configuration. The element with 14 electrons in the ground - state is Silicon, but it's not in the options.
• For 2 - 8 - 17 - 6: This is an excited - state configuration. The element with 33 electrons in the ground - state is Arsenic, but it's not in the options.
• For 2 - 8 - 18 - 8: The total number of electrons is 36, which is the atomic number of Krypton.

Step3: Determine ground - state and excited - state

Ground - state configurations follow the Aufbau principle, Pauli exclusion principle, and Hund's rule. Excited - state configurations have electrons in higher - energy orbitals before lower - energy ones are fully filled.

• 2 - 6 (Oxygen) is a ground - state.
• 2 - 18 - 8 - 1 (Copper) is a ground - state (Copper has a special electron - configuration due to stability).
• 2 - 7 - 6 (Phosphorus) is an excited - state.
• 2 - 8 - 1 - 1 is an excited - state.
• 2 - 8 - 3 - 1 is an excited - state.
• 2 - 8 - 17 - 6 is an excited - state.
• 2 - 8 - 18 - 8 (Krypton) is a ground - state.

Answer:

2 - 6: Oxygen
2 - 18 - 8 - 1: Copper
2 - 7 - 6: Phosphorus (excited - state)
2 - 8 - 1 - 1: Not in options (excited - state)
2 - 8 - 3 - 1: Not in options (excited - state)
2 - 8 - 17 - 6: Not in options (excited - state)
2 - 8 - 18 - 8: Krypton
Ground state: 2 - 6, 2 - 18 - 8 - 1, 2 - 8 - 18 - 8
Excited state: 2 - 7 - 6, 2 - 8 - 1 - 1, 2 - 8 - 3 - 1, 2 - 8 - 17 - 6