![]() One mole contains exactly the number of elementary entities given by the Avogadro constant. Structure 1.4.1-The mole (mol) is the SI unit of amount of substance.Structure 1.4-Counting particles by mass: The mole.Structure 1.3.7-Successive ionization energy (IE) data for an element give information about its electron configuration.Structure 1.3.6-In an emission spectrum, the limit of convergence at higher frequency corresponds to ionization.Structure 1.3.5-Each orbital has a defined energy state for a given electron configuration and chemical environment, and can hold two electrons of opposite spin.Structure 1.3.4-A more detailed model of the atom describes the division of the main energy level into s, p, d and f sublevels of successively higher energies.Structure 1.3.3-The main energy level is given an integer number, n, and can hold a maximum of2n^2 electrons.Structure 1.3.2-The line emission spectrum of hydrogen provides evidence for the existence of electrons in discrete energy levels, which converge at higher energies.Structure 1.3.1-Emission spectra are produced by atoms emitting photons when electrons in excited states return to lower energy levels.Structure 1.2.3-Mass spectra are used to determine the relative atomic masses of elements from their isotopic composition. ![]() Structure 1.2.2-Isotopes are atoms of the same element with different numbers of neutrons.Negatively charged electrons occupy the space outside the nucleus Structure 1.2.1-Atoms contain a positively charged, dense nucleus composed of protons and neutrons (nucleons).Structure 1.1.3-The temperature, T, in Kelvin (K) is a measure of average kinetic energy Ek of particles.Structure 1.1.2-The kinetic molecular theory is a model to explain physical properties of matter (solids, liquids and gases) and changes of state.Structure 1.1.1 Elements are the primary constituents of matter, which cannot be chemically broken down into simpler substances.Structure 1.1-Introduction to the particulate nature of matter (SL/HL).Models of the particulate nature of matter IBDP Chemistry SL and HL (2025 Specification).Mastering the Art of Revision: Tips and Tricks to Boost Your Success.Demonstrating the IB Learner Profile Attributes in Science: Examples and Applications.IGCSE Edexcel Science Prescribed Practical Experiments: A Comprehensive Guide.2025 IBDP Biology, Chemistry and Physics Subject guides (specification).
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