Multiple Choice
Which of the following is the correct electron configuration for nobelium (No, atomic number 102)?
3
views
10. Periodic Properties of the Elements
The Electron Configuration
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which of the following diagrams correctly represents the distribution of electrons in the electron shells of a helium atom?
A
No electrons in the first shell, two electrons in the second shell
B
Two electrons in the first shell, none in the second shell
C
One electron in the first shell, one electron in the second shell
D
One electron in the first shell, none in the second shell
Verified step by step guidance1
Recall that the electron configuration of an atom is determined by the number of electrons and the order in which electron shells (energy levels) are filled.
Identify the atomic number of helium, which is 2, meaning it has 2 electrons in total.
Understand that electrons fill the lowest energy shell first, which is the first shell (also called the K shell). This shell can hold up to 2 electrons.
Since helium has 2 electrons, both will occupy the first shell, and the second shell will have no electrons.
Therefore, the correct electron distribution diagram for helium shows two electrons in the first shell and none in the second shell.
Related Videos
Related Practice
The Electron Configuration practice set
Problem sets built by lead tutorsExpert video explanations