Multiple Choice
Which of the following is the correct electron configuration for nobelium (No)?
78
views
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
1s2 2s2 2p1
B
1s1 2s2 2p2
C
1s2 2s2 3s1
D
1s2 2s3
Verified step by step guidance1
Identify the atomic number of boron, which is 5. This means boron has 5 electrons to place in orbitals according to the Aufbau principle.
Recall the order of filling orbitals: 1s, 2s, 2p, 3s, etc. Each orbital can hold a specific maximum number of electrons: 1s and 2s can hold 2 electrons each, and 2p can hold up to 6 electrons.
Start filling the orbitals with electrons in order: first fill 1s with 2 electrons, then 2s with 2 electrons, and finally place the remaining 1 electron in the 2p orbital.
Write the electron configuration by indicating the number of electrons in each orbital: \$1s^2 2s^2 2p^1$.
Compare this configuration with the given options to confirm that \$1s^2 2s^2 2p^1$ correctly represents the electron configuration of boron.
Related Videos
Related Practice
