Multiple Choice
How many protons are present in an atom of cobalt (Co)?
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- 1. Intro to General Chemistry3h 48m
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2. Atoms & Elements
The Atom
Multiple Choice
How many electrons can the second energy level of an atom hold?
A
2
B
18
C
6
D
8
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Verified step by step guidance1
Recall that the number of electrons an energy level can hold is determined by the formula \$2n^2\(, where \)n$ is the principal quantum number (energy level).
Identify the second energy level, so \(n = 2\).
Substitute \(n = 2\) into the formula: \(2 \times (2)^2\).
Calculate the value inside the parentheses first: \((2)^2 = 4\).
Multiply by 2 to find the maximum number of electrons: \(2 \times 4 = 8\) electrons.
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