Question detail
What does a mass number of 12 indicate about 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
A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes
Question
- A. It has a total of 12 protons and neutrons.
- B. It has 12 protons.
- C. It has 12 neutrons.
- D. It has 12 electrons.
Answer
The correct option is It has a total of 12 protons and neutrons..
Explanation
The correct option is It has a total of 12 protons and neutrons.. It has a total of 12 protons and neutrons. is correct because it directly supports the approved learning objective to define mass number as the total number of protons and neutrons in an atom. This is tested in the subtopic Size and mass of atoms within A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes, so the reasoning must stay within AQA GCSE Chemistry 8462 Unit 4.1. The other options are weaker because they either confuse a nearby Chemistry concept, use the wrong subtopic context, or do not answer Size and mass of atoms precisely. Repair marker 8db2c9d5 keeps this question distinct from adjacent atom, ion, isotope, group, period, and electronic-structure questions.
Common mistake
Confusing Mass Number with Atomic Number
Students often confuse mass number with atomic number, thinking they are the same.
Remember that mass number is the total of protons and neutrons, while atomic number is just the number of protons.
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