Difficulty: Medium
Average Score: 94%
Entry Exam
Which subatomic particle can always be used to identify an atom?
Correct answer
A
Rationale
The correct answer is A: Protons. Protons are positively charged subatomic particles found in the nucleus of an atom. The number of protons in an atom's nucleus determines the element's identity. While neutrons and electrons are also essential components of an atom, it is the number of protons that uniquely identifies the element. Therefore, protons can always be used to identify an atom.