Edexcel A-Level Chemistry AS 2.3 What Is Meant By the Terms Atomic Proton Number and Mass Number Topic Practice

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Pearson Edexcel IAL Chemistry

Unit 1: Structure, Bonding and Introduction to Organic Chemistry

Topic 1: Formulae, Equations and Amount of Substance

Topic 2: Atomic Structure and the Periodic Table

2.1—The structure of an atom in terms of electrons, protons and neutrons

2.2—The relative mass and charge of protons, neutrons and electrons

2.3—What is meant by the terms ‘atomic (proton) number’ and ‘mass number’

2.4—The atomic number and the mass number to determine the number of each type of subatomic particle in an atom or ion

2.5—The term ‘isotope’

2.6—The basic principles of a mass spectrometer

2.7—Predict mass spectra

2.8—Define first, second and third ionisation energies and understand that all ionisation energies are endothermic

2.9—An orbital is a region within an atom that can hold up to two electrons with opposite spins

2.10—How ionisation energies are influenced by the number of protons in the nucleus, the electron shielding and the sub-shell

2.11—Ideas about electronic structure developed from: i an understanding that successive ionisation energies provide evidence

2.12—The shapes of s and p orbitals

2.13—Orbitals in sub-shells: i each take a single electron before pairing up ii pair up with two electrons of opposite spin

2.14—Predict the electronic configuration of atoms of the elements from hydrogen to krypton inclusive and their ions

2.15—Electronic configuration determines the chemical properties of an element

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

2.17—Represent data, in a graphical form (including the use of logarithms of first ionisation energies on a graph) for elements 1

2.18—Explain: i the trends in melting and boiling temperatures of the elements of Periods 2 and 3 of the Periodic Table in terms

Topic 3: Bonding and Structure

Topic 4: Introductory Organic Chemistry and Alkanes

Topic 5: Alkenes

Unit 2: Energetics, Group Chemistry, Halogenoalkanes and Alcohols

Unit 3: Practical Skills in Chemistry I

Assessed mathematical skills and measurement conventions

A-Level/Edexcel/Chemistry//AS/Question Bank/Unit 1: Structure, Bonding and Introduction to Organic Chemistry/Topic 2: Atomic Structure and the Periodic Table/2.3—What is meant by the terms ‘atomic (proton) number’ and ‘mass number’

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