Multiple Choice
Which of the following best describes how an electron can move from a lower energy shell to a higher energy shell?
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10. Periodic Properties of the Elements
The Electron Configuration
Multiple Choice
Which of the following is the correct electron configuration for the element boron (B)?
A
1s^2 2s^2 2p^2
B
1s^2 2s^1 2p^2
C
1s^2 2s^2 2p^1
D
1s^2 2s^1 2p^3
Verified step by step guidance1
Step 1: Identify the atomic number of boron (B), 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: electrons fill orbitals starting from the lowest energy level to higher ones, following the sequence 1s, 2s, 2p, etc.
Step 3: Begin filling the orbitals with electrons: first fill the 1s orbital with 2 electrons, then the 2s orbital with 2 electrons, and finally place the remaining electron in the 2p orbital.
Step 4: Write the electron configuration by indicating the number of electrons in each orbital: \$1s^2 2s^2 2p^1$.
Step 5: Verify that the total number of electrons adds up to 5 and that the configuration follows the Pauli exclusion principle and Hund's rule.
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