객관식
How many electrons are in a neutral atom of phosphorus (P)?
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9. Electrons in Atoms and the Periodic Table
Electronic Structure: Number of Electrons
Multiple Choice
How many electrons are in a neutral lithium atom?
A
7
B
10
C
3
D
6
검증된 단계별 안내1
Recall that in a neutral atom, the number of electrons is equal to the number of protons, which is the atomic number of the element.
Identify the element given in the problem, which is lithium.
Look up the atomic number of lithium on the periodic table; lithium has an atomic number of 3.
Since lithium is neutral, the number of electrons equals its atomic number, so it has 3 electrons.
Therefore, the number of electrons in a neutral lithium atom is 3.
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