GCSE Edexcel Higher Combined Science Chemistry · Topic 1 of 7
Choose a subtopic. Learn the core ideas behind atomic structure, bonding, the periodic table, and chemical calculations. 57 lessons in 6 subtopics.
Revise Topic 1: Key concepts in chemistry for GCSE Edexcel Higher Combined Science Chemistry. 57 lessons across 6 subtopics.
57
Lessons
6
Subtopics
Topic 1: Key concepts in chemistry has 6 subtopics:
57 lessons, grouped by subtopic.
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Go back to the full GCSE Edexcel Higher Combined Science Chemistry topic list, or practise this topic with past-paper questions.
Learn the core ideas behind atomic structure, bonding, the periodic table, and chemical calculations. 57 lessons in 6 subtopics.
The plum pudding model is Thomson's atomic model of a sphere of positive charge with negative electrons embedded throughout, like raisins in a pudding. The Early atomic models: from spheres to plum pudding notes cover this in full.
Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons. The Isotopes and Atomic Notation notes cover this in full.
An element is a substance made of only one type of atom, represented by a unique chemical symbol. The Elements, Atoms and Symbols notes cover this in full.
A compound is a substance formed when two or more elements are chemically combined in fixed proportions. The Compounds and Chemical Formulae notes cover this in full.
The modern periodic table has 118 elements arranged in 18 groups and 7 periods. The Mendeleev's breakthrough and modern understanding notes cover this in full.
An ion is an atom or group of atoms that has gained or lost electrons, giving it an overall electric charge. The Ion Formation and Electron Arrangement notes cover this in full.
Relative atomic mass = sum of (isotope mass × abundance) ÷ 100. The Understanding Relative Atomic Mass notes cover this in full.
An alloy is a mixture of two or more elements, at least one of which is a metal. The Layered Structures and Alloys notes cover this in full.