객관식
A copper penny has a net charge of -3.2 × 10^{-19} C. How many electrons were transferred to create this charge on the penny?
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2. Atoms & Elements
The Atom
Multiple Choice
How many electrons does a neutral lithium atom have?
A
5
B
3
C
7
D
1
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검증된 단계별 안내1
Recall that a neutral atom has an equal number of protons and electrons.
Identify the atomic number of lithium, which is the number of protons in its nucleus. Lithium's atomic number is 3.
Since lithium is neutral, the number of electrons must be equal to the number of protons.
Therefore, the number of electrons in a neutral lithium atom is equal to its atomic number, which is 3.
Conclude that a neutral lithium atom has 3 electrons.
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