객관식
How many protons are in one atom of lithium (Li)?
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4. Atoms and Elements
Subatomic Particles (Simplified)
Multiple Choice
How many protons are in a neutral potassium atom (K)?
A
18
B
39
C
20
D
19
검증된 단계별 안내1
Recall that the number of protons in an atom is equal to its atomic number, which uniquely identifies the element.
Identify the element given in the problem, which is potassium (K).
Look up the atomic number of potassium on the periodic table; this number represents the number of protons in a neutral potassium atom.
Understand that the atomic mass (such as 39) represents the total number of protons and neutrons, not just protons.
Conclude that the number of protons in a neutral potassium atom is equal to its atomic number, which is 19.
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