객관식
In a neutral atom of lithium (Li), how many protons are in the nucleus?
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4. Atoms and Elements
Subatomic Particles (Simplified)
객관식
Which element has 18 protons in its nucleus?
A
Calcium (Ca)
B
Potassium (K)
C
Chlorine (Cl)
D
Argon (Ar)
검증된 단계별 안내1
Recall that the number of protons in the nucleus of an atom is called the atomic number, which uniquely identifies an element.
Look up the atomic numbers of the given elements: Calcium (Ca), Potassium (K), Chlorine (Cl), and Argon (Ar).
Compare each element's atomic number to 18, since the problem asks for the element with 18 protons.
Identify the element whose atomic number is exactly 18, which means it has 18 protons in its nucleus.
Confirm that this element is Argon (Ar), as it has an atomic number of 18.
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