2.1 Matter: What are materials made from?
Use particle and atomic models to describe states, elements, isotopes, formulae and relative masses.
How to study WJEC GCSE The Sciences
Move from a scientific model to a prediction or method, collect or interpret evidence, show quantitative working and finish with a conclusion whose limits match the data.
Core concepts
Concept 1
Use the particle model to explain state and change of state.
Exam cue: Identify the unit, entered tier, supplied reference material, command word and relevant scientific enquiry skill.
Concept 2
Determine atomic structure, isotopes and relative atomic mass.
Exam cue: Separate particle arrangement and movement from atomic composition, then show every relative-mass contribution.
Concept 3
Write chemical formulae and calculate relative formula mass.
Exam cue: Use scientific terminology, show quantitative working with units, and connect conclusions to data and the stated model.
Concept 4
Official subtopics: 2.1.1 The states of matter; 2.1.2 Elements and chemical symbols; 2.1.3 Atomic structure; 2.1.4 Isotopes and relative atomic mass; 2.1.5 Molecules and chemical formulae; 2.1.6 Relative formula mass.
Concept 5
Scientific enquiry and mathematical skills apply in this topic; bold amplification is Higher Tier only.
Risk pitfalls and guardrails
Confusing mass number with relative atomic mass or changing subscripts when balancing an equation.
Guardrail: Do not import outgoing 3430QD content, another science route, a fixed required-practical list or unsupported tier and connection assumptions.
Recalling a fact without applying it to the observation, data, practical method or unfamiliar context.
Guardrail: Use the live secure pack: Task A may use groups of up to three; Task B is individual and highly controlled. Two enquiries are selected by the centre from three.
Importing content, required practicals, tier rules or paper structure from the outgoing WJEC or another awarding-body route.
Guardrail: Bold amplification is Higher-only. Units 1-6 may mix tiers, but Unit 7 is untiered.
Memory anchors
Element
A substance containing atoms with the same number of protons.
Isotope
Atoms of one element with the same protons but different neutrons.
Atomic number
The number of protons in an atom's nucleus.
Mass number
The total number of protons and neutrons in a nucleus.
Relative formula mass
The sum of relative atomic masses in a formula unit.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
An element is assigned its atomic number from the count of which particle in each nucleus? Keep the particle model separate from the proton, neutron and electron model. Use the overall trend rather than an isolated value.
An atom has mass number 23 and atomic number 11. How many neutrons does it contain? Keep the particle model separate from the proton, neutron and electron model. Keep observations separate from scientific inferences.
Answer all questions to submit.
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Move forward only after this module is stable.
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