Year 10 - Science
Modern periodic table and electron configuration
Atomic structure and the periodic table
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit covers the atomic model, relative atomic mass, isotopes, and the structure of the modern periodic table. It explains how atomic structure influences element positioning, properties, and reactivity. The focus is on identifying trends and using models to develop scientific explanations.
Lesson Summary
You will learn to describe the way the modern periodic table is organised and draw the electronic configuration of the first twenty elements.
Key Notes
- The periodic table is ordered by increasing atomic number (proton number).
- The periodic table is split into periods and groups.
- The position of an element in the periodic table is linked to its atomic number and the arrangement of its electrons.
- Elements can be classed as metals or non-metals according to their position on the periodic table.
- A useful model for atoms arranges electrons in shells around the nucleus.
Vocabulary To Learn
- electron shell: is an energy level outside the nucleus which contains electrons.
- electronic configuration: of an atom of an element describes how the electrons are arranged in shells.
- period: is a horizontal row on the periodic table, it corresponds to the number of shells of an atom in an element that have electrons in them.
- group: is a column on the periodic table that corresponds to the number of electrons in the outer shell of an atom.
Common Mistakes To Avoid
- Pupils often confuse the atomic number and mass number with regard to the number of electrons in an atom. They also can confuse the number of electrons which can be held by each shell.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
The periodic table is ordered by increasing atomic number (proton number). The periodic table is split into periods and groups.
2. Define this scientific word and use it in context. 'electron shell'
is an energy level outside the nucleus which contains electrons. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Pupils often confuse the atomic number and mass number with regard to the number of electrons in an atom. They also can confuse the number of electrons which can be held by each shell. Correction: Emphasise that the lower number (atomic number/proton number) represents the number of electrons (reference to the mass being larger can help). Practise as many electron arrangements as possible.
More Lessons In This Unit
- Atomic number and mass number Study Guide
- Atomic structure (negligible electron mass) Study Guide
- Atomic structure (very small electron mass) Study Guide
- Atoms, elements and compounds Study Guide
- Developing a model for atoms Study Guide
- Development of the periodic table Study Guide
- Isotopes Study Guide
- Isotopes and relative atomic mass Study Guide
- Relative formula mass Study Guide
- Using the periodic table: atomic and mass number Study Guide
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