Materials · JHS2 Science

Lesson notes

Learning Objectives

Indicator: B8.1.1.2.2 - Explain the arrangement of elements in terms of the number of protons in the nuclei of atoms of each element.

By the end of the lesson, learners can:

State that the atomic number of an element equals the number of protons in the nucleus of its atoms.
Use the periodic table to identify the atomic number and position of given elements.
Draw the electron configuration (distribution of electrons in shells) for atoms of the first 20 elements.
Explain how ions are formed when atoms lose or gain electrons.
Describe a molecule as a combination of two or more atoms held together by chemical bonds.

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Curriculum details

Strand: Diversity of Matter (Strand 1)
Sub-strand: Materials (1.1)
Content standard: B8.1.1.2 - Demonstrate understanding of atoms and the atomic structure of elements in the periodic table
Indicator: B8.1.1.2.2 - Explain the arrangement of elements in terms of the number of protons in the nuclei of atoms of each element.
Suggested placement: Term 1, Week 3 (Week 3 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: Science, Common Core Programme (JHS1-JHS3), 2023, p. 55
Transcribed from the official NaCCA publication. Check this page against the source.

Exemplars (from the NaCCA curriculum)

1. Explain how elements are arranged in order of the number of protons using the periodic table.
2. Draw the distribution of electrons (electron configuration) in the atoms.
3. Explain the formation of ions.
4. Describe a molecule as a combination of atoms.