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Periodicity
This topic connects periodic position to electronic structure, bonding and physical properties.
7
Objectives
35
Flashcards
35
Questions
90 min
Study time
AQAA LevelChemistryInorganic chemistry
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Syllabus checklist
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7 objective pages available
Classification3 objectives
- Classify elements as s, p, d or f block from their position in the Periodic Table.
- Explain how proton number determines periodic table position.
- Link block classification to electron configuration.
Physical properties of Period 3 elements4 objectives
- Explain the trend in atomic radius across Period 3.
- Explain the trend in first ionisation energy across Period 3.
- Explain melting point trends across Period 3 using structure and bonding.
- Use periodic data to justify explanations of trends.
Key terms
s block elementsp block elementsProton NumberPeriodic Table Positionblock classificationelectron configurationatomic radiusperiodic trendfirst ionisation energyPeriod 3melting pointbonding
Exam tips
- Classifying Elements in the Periodic Table: Remember that elements in the s block have their outermost electrons in the s orbital, while p block elements have their outermost electrons in the p orbital. Use the periodic table to identify the block based on the group number.
- Understanding Proton Number and Periodic Table Position: Explain clearly by remember that the position of an element in the periodic table is determined by its proton number, which is the same as its atomic number. This helps in classifying elements correctly. Link the point to Classification, then state the evidence, calculation, mechanism, observation, or conclusion required by the question.
Common mistakes
- Misclassifying Element Blocks: To classify elements correctly, refer to their position in the periodic table. The block classification is determined by the highest energy sublevel that is being filled. For example, elements in Group 1 and 2 are s block, Groups 13-18 are p block, Transition metals are d block, and Lanthanides and Actinides are f block.
- Misunderstanding Proton Number: Remember that the proton number (atomic number) is the number of protons in the nucleus of an atom and directly determines the element's position in the periodic table. For example, for carbon (C), the atomic number is 6, meaning it has 6 protons, placing it in group 14 and period 2.
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