Question detail
Which pair of particles is found in the nucleus at the centre of an atom?
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. Protons and neutrons
- B. Electrons and protons
- C. Neutrons and electrons
- D. Only electrons
Answer
The correct answer is protons and neutrons. In the nuclear model, the atom has a tiny central nucleus containing protons and neutrons, with electrons arranged outside it.
Explanation
Protons and neutrons are found in the nucleus of an atom. Electrons are not in the nucleus; they occupy the space around it. This question is different from asking for atomic radius: it tests the internal structure of an atom. A secure explanation says that the nucleus is tiny and dense, contains protons and neutrons, and is surrounded by electrons. That avoids confusing atomic size with nuclear composition.
Common mistake
Misinterpreting Atomic Size
Students often think the radius of an atom is 1 × 10⁻¹⁰ m for all elements, ignoring that atomic radius varies with element and bonding environment.
Explain that 1 × 10⁻¹⁰ m is an average value for a typical neutral atom; actual radii differ between elements and depend on factors such as nuclear charge and electron shielding.
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