객관식
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
객관식
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
검증된 단계별 안내1
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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