Multiple Choice
How many p orbitals are occupied by electrons in a krypton (Kr) atom in its ground state?
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10. Periodic Properties of the Elements
The Electron Configuration
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
What is the total number of electrons required to completely fill the first two main energy levels (n = 1 and n = 2) of an atom?
A
10
B
18
C
12
D
8
Verified step by step guidance1
Recall that the maximum number of electrons that can occupy a main energy level (shell) is given by the formula $2n^2$, where $n$ is the principal quantum number (energy level).
Calculate the maximum number of electrons in the first energy level ($n=1$) using the formula: $2 \times (1)^2 = 2$ electrons.
Calculate the maximum number of electrons in the second energy level ($n=2$) using the formula: $2 \times (2)^2 = 8$ electrons.
Add the electrons from the first and second energy levels to find the total number of electrons required to completely fill both levels: $2 + 8$.
The sum gives the total number of electrons needed to fill the first two main energy levels of an atom.
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