O Levels Chemistry (5070)•5070/11/M/J/25
Explanation
Identify element by atomic structure in diagram
Steps:
- Examine the atomic model to count protons in the nucleus.
- Confirm atomic number matches the proton count.
- Compare to periodic table elements with that atomic number.
- Select the matching element from choices.
Why A is correct:
- Beryllium has atomic number 4, matching a nucleus with 4 protons as per atomic theory.
Why the others are wrong:
- B: Boron has 5 protons, not matching the diagram.
- C: Carbon has 6 protons, not matching the diagram.
- D: Magnesium has 12 protons, not matching the diagram.
Final answer: A
Topic: Atomic structure and the Periodic Table
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