2.16—The Periodic Table is divided into blocks, such as s, p and d, and know the number of electrons that can occupy s, p and d

Know that the Periodic Table is divided into blocks, such as s, p and d, and know the number of electrons that can occupy s, p and d sub-shells in the first four quantum shells.

Use —the periodic table is divided into blocks, such as s, p and d, and know the number of electrons that can occupy s, p and d to connect the rule to the data and decision in the question.

This matters because —the periodic table is divided into blocks, such as s, p and d, and know the number of electrons that can occupy s, p and d determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply —the periodic table is divided into blocks, such as s, p and d, and know the number of electrons that can occupy s, p and d to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: —The Periodic Table is divided into blocks, such as s, p and d, and know the number of electrons that can occupy s, p and d is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.