中文（繁體）
中文（简体）
English
S4 Chemistry: The Periodic Table — Practice Paper 2 (10 Questions)
S4 Chemistry: The Periodic Table — Practice Paper 2 (10 Questions)
Paper 2 moves from position to properties: group trends, radius across a period, ion formation, isotopes and relative formula mass.
Quick answer Ten questions, about 20 minutes. Items 01 to 03 cover group trends and the noble gases; 04 to 06 cover reading position from arrangement and forming ions; 07 to 09 cover radius, isotopes and formula mass; item 10 redoes the group-outer electron link.
01 Paper details (check answers afterwards)
| Item | Detail |
|---|---|
| Questions | 10 questions |
| Suggested time | 20 minutes |
| Difficulty mix | Foundation 4 · Intermediate 3 · Challenge 2 · Error redo 1 |
| Chapter | Chapter: Secondary 4 Maths: Equivalent Fractions and Decimals — Tutor Lesson Plan |
| Level | Secondary 4 |
02 Questions (10 items)
- FoundationRank lithium, sodium and potassium by how vigorously they react with water.
- FoundationRank fluorine, chlorine, bromine and iodine by reactivity.
- FoundationWhat do the arrangements of helium, neon and argon share?
- FoundationPotassium is 2, 8, 8, 1. Which period is it in?
- IntermediateFor the element with atomic number 20, give the arrangement and position.
- IntermediateA magnesium atom (2, 8, 2) loses two electrons. What is the ion arrangement?
- IntermediateHow does atomic radius change across a period? Use sodium 186 pm, magnesium 160 pm and aluminium 143 pm.
- ChallengeHow many protons and neutrons do chlorine-35 and chlorine-37 hold?
- ChallengeWhat is the relative formula mass of NaCl? (Na 23, Cl 35.5)
- Error redoError drill: why does “group number equals outer electrons” fail?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | Potassium > sodium > lithium. | Metallic character rises down a group. |
| 2 | Fluorine > chlorine > bromine > iodine. | Non-metallic character falls down the halogen group. |
| 3 | Full outer shells: helium 2, neon 2,8, argon 2,8,8. | A full shell makes noble gases unreactive. |
| 4 | Period 4. | The number of shells equals the period number. |
| 5 | 2, 8, 8, 2; Period 4 Group II (calcium). | Two outer electrons place it in Group II. |
| 6 | 2, 8. | Losing the two outer electrons leaves a neon-like core. |
| 7 | It falls: 186 > 160 > 143 pm. | A larger nuclear charge pulls the same shells in tighter. |
| 8 | Both have 17 protons; 18 and 20 neutrons. | Isotopes share protons but differ in neutrons. |
| 9 | 58.5. | Add the relative atomic masses of the atoms. |
| 10 | It holds for main groups only; iron 2, 8, 14, 2 is Group VIII. | Transition metals show no fixed group-outer electron link. |
04 What to do after marking
- After marking, redo only the wrong items and write down which step went wrong (formula, unit, or misread number).
- Repeat the same item two days later; move to the next paper only when both attempts are correct.
- Parents only need the answer and note columns; there is no need to explain every item.
Find a tutor freeTutor Registration →
Questions and answers are written originally by the TutorZone team and are not taken from any school, publisher or examination authority paper. Every value is checked by computer.