Periodicity · SHS1 Chemistry

Lesson notes

Learning Objectives

Indicator: 1.2.1.LI.1 - Use the electron configuration of elements to determine their position on the periodic table.

By the end of the lesson, learners can:

Write the electron configuration of the first thirty elements using the orbital notation (1s, 2s, 2p, etc.).
Determine the period of an element from the highest principal quantum number (n) in its electron configuration.
Determine the group of an element from the number of electrons in its outermost shell (valence electrons) and identify its block (s, p, or d).
Classify the first thirty elements into s-block, p-block, and d-block, and into metals, semi-metals, and non-metals using their electron configurations.
Locate any of the first thirty elements on a blank periodic table by applying the relationship between electron configuration and position.

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Curriculum details

Strand: Systematic Chemistry of the Elements (Strand 2)
Sub-strand: Periodicity (2.1)
Content standard: 1.2.1.CS.1 - Demonstrate knowledge and understanding of how periodic properties change with atomic number and principal quantum number. 1.2.1.LO.1 Describe and explain the trends of periodic properties on the periodic table.
Indicator: 1.2.1.LI.1 - Use the electron configuration of elements to determine their position on the periodic table.
Suggested placement: Semester 2, Week 8 (Week 28 of the year)
Our suggestion, laid out in curriculum order across three terms of twelve weeks. NaCCA does not fix the week, so follow your school's scheme of learning.
Curriculum reference: NaCCA curriculum document, p. 46

Exemplars (from the NaCCA curriculum)

Activity-Based Learning: Independently, write the electron configuration of the first thirty elements based on the orbital notation.
Collaborative Learning: In pairs, classify the elements according to the following categories:
- The blocks (s, p, d)
- Groups (IUPAC system and the roman numeral system).
- The period in which the element belongs.
- Metals, semi-metals and non-metals.
- Describe the physical properties (hardness, density, melting point, boiling point and physical state) and chemical properties of some representative elements (groups 1, 2 and the noble gases).
- Make a design of the periodic table in pairs.
Teaching and Learning Materials:
- * Videos on the periodic table * Worksheets to write the electronic configuration of the first thirty elements
- CHARTS * Chart of the periodic table * Flipcharts for group presentations
Assessment (1.2.1.AS.1). The document marks these depth-of-knowledge levels for this indicator: Level 2 Skills of conceptual understanding.