객관식
How many electrons does a neutral aluminum atom have?
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9. Electrons in Atoms and the Periodic Table
Electronic Structure: Number of Electrons
객관식
How many electrons are in a neutral sodium atom (Na)?
A
11
B
12
C
10
D
23
검증된 단계별 안내1
Identify the atomic number of sodium (Na) from the periodic table. The atomic number represents the number of protons in the nucleus of an atom.
Recall that in a neutral atom, the number of electrons equals the number of protons to balance the positive charge of the nucleus.
Since sodium has an atomic number of 11, it has 11 protons.
Therefore, a neutral sodium atom must have 11 electrons to be electrically neutral.
Conclude that the number of electrons in a neutral sodium atom is equal to its atomic number, which is 11.
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