Question detail
What is the atomic number of an element?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Atoms and isotopes
Question
- A. The number of neutrons in the nucleus
- B. The total number of protons and neutrons
- C. The number of protons in the nucleus
- D. The number of electrons in an atom
Answer
The number of protons in the nucleus
Explanation
The atomic number is defined as the number of protons in the nucleus of an atom, which determines the element's identity.
Common mistake
Confusing Atomic Number and Mass Number
Students often confuse atomic number with mass number, thinking both refer to the same quantity.
Remind students that atomic number is the number of protons in the nucleus, while mass number is the total number of protons and neutrons.
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