O-LevelChemistryAtomic Structure5070/11 · May/June 2019 · Q51 Mark

Cobalt is a transition element. A particle of cobalt contains 24 electrons and has a nucleon number of 60. Which statement about this particle is correct?

AIt is a 3+ ion.

BIt is a 3- ion.

CIt contains 24 neutrons.

DIt contains 24 protons.

✓ Correct answer

A: It is a 3+ ion.

Oracle Prep sorts past-paper questions by topic, so you can drill Atomic Structure and see which topics are most likely to come up next.

Topic: Atomic Structure, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2019 Paper 1 Variant 1, question 5.

Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content

The diagram shows the structures of the atoms of elements L and M. The elements combine to form a compound. What is t…

Element Q is in Period 3 of the Periodic Table. It can form ions with the formula Q³⁻. Which element is most likely t…

A particle contains 34 protons, 45 neutrons and 36 electrons. Which symbol is correct for this particle?

A simple cell is shown below. Which statement about the process occurring when the cell is in operation is correct?

The usual conditions for the Haber process are 250 atm pressure, 450°C and an iron catalyst. Which change in conditio…

Chlorine can be manufactured by the following reaction. 4HCl(g) + O2(g) ⇌ 2H2O(g) + 2Cl2(g) ΔH is negative A mixture …