객관식
Which of the following is the smallest possible particle of an element that retains its chemical properties?
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2. Atoms & Elements
The Atom
Multiple Choice
How many electrons are present in a neutral atom of lithium?
A
3
B
7
C
1
D
5
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검증된 단계별 안내1
Recall that in a neutral atom, the number of electrons is equal to the number of protons.
Identify the atomic number of lithium from the periodic table, which represents the number of protons in lithium.
The atomic number of lithium is 3, meaning it has 3 protons.
Since the atom is neutral, the number of electrons must also be 3 to balance the positive charge of the protons.
Therefore, a neutral lithium atom contains 3 electrons.
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