Multiple Choice
Which of the following electron configurations represents an atom in an excited state?
10. Periodic Properties of the Elements
The Electron Configuration
Multiple Choice
Which of the following is the correct electron configuration for boron (atomic number 5)?
A
1s^2 2s^1 2p^1
B
1s^2 2s^1 2p^2
C
1s^2 2s^2 2p^2
D
1s^2 2s^2 2p^1
Verified step by step guidance1
Step 1: Identify the atomic number of boron, which is 5. This means boron has 5 electrons to place in its electron configuration.
Step 2: Recall the order in which electron orbitals are filled according to the Aufbau principle: 1s, 2s, then 2p.
Step 3: Fill the 1s orbital first with 2 electrons: \$1s^2$.
Step 4: Next, fill the 2s orbital with 2 electrons: \$2s^2$.
Step 5: Place the remaining 1 electron in the 2p orbital: \$2p^1\(. Therefore, the electron configuration is \)1s^2 2s^2 2p^1$.
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