O-LevelChemistryAtomic Structure5070/21 · May/June 2022 · Q48 Marks

The table shows information about some particles. | particle | proton number | nucleon number | |:---------|:--------------|:---------------| | 35C1 | 17 | 35 | | 17 | | | | 35C1- | 17 | 35 | | 17 | | | | 39K | 19 | 39 | | 19 | | | | 39K+ | 19 | 39 | | 19 | | |

(a)State the number of neutrons in 35Cl. 17[1]
(b)State the number of electrons in 35C1-. 17[1]
(c)39K is the full symbol for one isotope of potassium. 19 Suggest the full symbol for one other isotope of potassium.[1]
(d)Describe how a potassium ion, K+, is formed from a potassium atom, K.[1]
(e)(i)Potassium chloride is an ionic compound. Potassium chloride has a high melting point and a high boiling point. Explain why potassium chloride has a high melting point.[2]
(e)(ii)Predict two other physical properties of potassium chloride. 1 2[2]

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Topic: Atomic Structure, O-Level Chemistry (syllabus 5070). Structured question, 8 marks.
Source: O-Level Chemistry, May/June 2022 Paper 2 Variant 1, question 4.

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