객관식
Which of the following combinations of atoms makes up a molecule of water?
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- 1. Intro to General Chemistry3h 46m
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- Magnetic Properties of Complex Ions9m
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- Magnetic Properties of Complex Ions: Octahedral Complexes11m
2. Atoms & Elements
The Atom
Multiple Choice
How many electrons are present in a neutral atom of sodium (Na)?
A
23
B
12
C
11
D
10
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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 the atom.
Recall that in a neutral atom, the number of electrons is equal to the number of protons to balance the positive charge of the nucleus.
Look up the atomic number of sodium, which is 11. This means sodium has 11 protons.
Since the atom is neutral, the number of electrons must also be 11 to balance the charge.
Therefore, the number of electrons in a neutral sodium atom is equal to its atomic number, which is 11.
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