Multiple Choice
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
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
If an atom has 17 protons, which element is it?
A
Potassium
B
Sodium
C
Chlorine
D
Oxygen
Verified step by step guidance1
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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