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2017 O Level Chem P1 Q5 — Atomic Structure / Ions and Periodic Position Solution

Atomic Structure / Ions and Periodic Position 2017 O Level Pure Chemistry · Paper 1 · Q5

Question

The diagram shows the structure of an ion. What is the correct position in the Periodic Table of the element from which this ion was formed? Question diagram

Question diagram

Question diagram (continued)

A
B
C
D

Correct answer: C

Video Solution

Explanation

Answer: C. The nucleus contains 13 protons, so the proton number is 13, which is aluminium. Aluminium is in period 3, group III.

The ion drawn is \(\text{Al}^{3+}\) with the electron arrangement 2,8, but the element is identified by its 13 protons, not by the ion's electrons.

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