객관식
Which of the following is the smallest chemical unit that retains the properties of a pure substance?
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2. Atoms & Elements
The Atom
Multiple Choice
If an atom has 17 protons, which element is it?
A
Potassium
B
Sodium
C
Chlorine
D
Oxygen
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검증된 단계별 안내1
Recall that the number of protons in an atom's nucleus defines the element's atomic number.
Identify the atomic number given in the problem, which is 17 protons.
Use the periodic table to find the element with atomic number 17.
Recognize that the element with atomic number 17 is Chlorine (Cl).
Confirm that the other options (Potassium, Sodium, Oxygen) have different atomic numbers: Potassium (19), Sodium (11), Oxygen (8).
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