객관식
How many protons and electrons are present in a neutral atom of strontium (Sr)?
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2. Atoms & Elements
The Atom
Multiple Choice
How many electrons are present in a neutral sodium atom?
A
10
B
23
C
11
D
12
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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 sodium (Na) from the periodic table, which represents the number of protons in the nucleus.
For sodium, the atomic number is 11, meaning it has 11 protons.
Since the atom is neutral, the number of electrons must also be 11 to balance the positive charge of the protons.
Therefore, the number of electrons in a neutral sodium atom is equal to its atomic number, which is 11.
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