OCR A-Level Chemistry AS Breadth in chemistry (01), June 2024: Question 6
1 mark · Easy difficulty · Multiple Choice
Identify which statement about the periodic table is not correct among the given options.
Practise this questionQuestion
Question text
6 Which statement about the periodic table is not correct?
A Elements in the same group have similar chemical properties.
B The elements are ordered by increasing atomic mass.
C The elements are ordered by increasing atomic number.
D There is a repeating trend of physical and chemical properties across the periods.
Your answer [1]
Mark scheme
Show the mark scheme
6 B 1
How to answer it
Periodic Table Statements Analysis
What this question tests
This question assesses your foundational understanding of the modern Periodic Table, how elements are arranged, and the distinction between historical ordering (atomic mass) and modern ordering (atomic number). It tests your knowledge of periodicity, including trends in physical and chemical properties across periods and within groups.
Question 6
Identifying incorrect statements about the periodic table
✅ Correct Answer
Option B
The elements are not ordered by increasing atomic mass in the modern periodic table; they are ordered by increasing atomic number (number of protons).
💡 Key Knowledge
- Groups (Columns): Elements share similar chemical properties because they have the same number of outer shell electrons.
- Atomic Number: Mendeleev used atomic mass, but H.J.S. Moseley and the modern periodic table use atomic number (proton number).
- Periodicity: Physical and chemical properties show repeating (periodic) trends across periods.
🧠 Exam Technique
Read multiple-choice stems very carefully for negative phrasing like not correct . Evaluate each statement one by one and cross out true statements until the false statement remains.
❌ Common Errors
Students sometimes confuse Mendeleev's original periodic table (which was ordered by atomic mass with a few inversions) with the modern periodic table, leading them to mistakenly select Option C or D as incorrect.
Topics
Module 3: Periodic table and energy · 3.1 The periodic table
Question and mark scheme from the OCR A-Level Chemistry examination, AS Breadth in chemistry (01), June 2024. QuestionVault is an independent revision resource; questions remain the copyright of the awarding body.