Atom: The smallest chemical particle. Made up of positively charged central nucleus (protons and neutrons) and shells of negatively charged electrons.
Atomic Number: The number of protons in an atom
Electron: Negatively charged subatomic particle with a relative mass of 0. Orbits the nucleus in shells and can be transferred to other atoms to form charged ions.
Group: The vertical organisation of elements in the periodic table. From left to right, there are 8 groups: 1, 2, 3, 4, 5, 6, 7, 0
Ion: A charged chemical particle, an atom that has lost or gained electrons.
Isotope: Atoms with the same number of protons but different numbers of neutrons
Mass Number: Number of protons + Number of neutrons
Nucleus: The central part of an atom comprised of protons and neutrons. Positively charged.
Neutron: A subatomic particle without charge and relative mass 1. Found in the nucleus.
Period: The horizontal organisation in the periodic table, numbers increasing top to bottom.
Periodic Table: A way of organising the chemical elements by atomic number, with patterns relating to reactivity and other properties.
Proton: A positively charged subatomic particle with a relative mass of 1. Found in the nucleus.
Relative Atomic Mass: The mass of an atom, relative to carbon 12.
Valence Electron(s): The electrons found in the outer electron shell.
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Section 3 a) Specification
3.1 explain the terms homologous series, hydrocarbon, saturated, unsaturated, general formula and isomerism. A homologous series is a grou...
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The group 7 elements, also known as halogens, are F, fluorine, Cl, chlorine, Br, bromine, I, iodine, and At, astatine. They all have antimic... -
Metals can be placed in an order of most to least reactive, called the reactivity series. This can be remembered using an acronym: Plea... -
Particles of a substance can be present in different physical states, the states of matter. They are solid, liquid and gas, and increasing ...
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