객관식
Which statement is true with respect to an atom?
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2. Atoms & Elements
The Atom
Multiple Choice
How many electrons are present in a neutral atom of phosphorus?
A
14
B
16
C
15
D
31
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검증된 단계별 안내1
Identify the atomic number of phosphorus 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 is equal to the number of protons to balance the positive charge of the nucleus.
Note that phosphorus has an atomic number of 15, which means it has 15 protons.
Since the atom is neutral, the number of electrons must also be 15 to balance the charge.
Therefore, the number of electrons in a neutral phosphorus atom is equal to its atomic number, which is 15.
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