A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes key terms

Atom

The smallest part of an element that can exist. In Atoms, elements and compounds, this term helps explain define an atom as the smallest part of an element that can exist for AQA GCSE Chemistry 8462.

Element

A substance made from one type of atom, represented by a chemical symbol. In Atoms, elements and compounds, this term helps explain define an atom as the smallest part of an element that can exist for AQA GCSE Chemistry 8462.

chemical symbol

A one or two-letter notation used to represent an element, such as O for oxygen.

element

A pure substance made from one type of atom, represented in the periodic table. In Atoms, elements and compounds, this term helps explain explain that each element is represented by a chemical symbol, using examples such as O for oxygen and Na for sodium for AQA GCSE Chemistry 8462.

element

A substance made from one type of atom, represented in the periodic table. In Atoms, elements and compounds, this term helps explain describe elements as substances made from one type of atom and shown in the periodic table for AQA GCSE Chemistry 8462.

atom

The smallest part of an element that can exist. In Atoms, elements and compounds, this term helps explain describe elements as substances made from one type of atom and shown in the periodic table for AQA GCSE Chemistry 8462.

compound

A substance made from two or more elements chemically combined in fixed proportions.

element

A substance that consists of only one type of atom and is represented by a chemical symbol.

compound

A substance made from two or more elements chemically combined in fixed proportions.

chemical reaction

A process that involves the transformation of substances, allowing compounds to be separated into their constituent elements.

element

A substance made from one type of atom, represented by a chemical symbol. In Atoms, elements and compounds, this term helps explain use the names and symbols of the first 20 elements in the periodic table for AQA GCSE Chemistry 8462.

chemical symbol

A notation representing an element, such as O for oxygen or Na for sodium. In Atoms, elements and compounds, this term helps explain use the names and symbols of the first 20 elements in the periodic table for AQA GCSE Chemistry 8462.

Group 1 elements

Elements in Group 1 of the periodic table, known as alkali metals, which include lithium (Li), sodium (Na), and potassium (K).

Group 7 elements

Elements in Group 7 of the periodic table, known as halogens, which include fluorine (F), chlorine (Cl), and bromine (Br).

compound

A substance made from two or more elements chemically combined in fixed proportions.

formula

A representation of a compound using symbols for the elements and numerical subscripts to indicate the number of atoms.

word equation

A representation of a chemical reaction using the names of the reactants and products.

reactants

Substances that undergo a chemical change in a reaction. In Atoms, elements and compounds, this term helps explain write word equations for reactions in the Chemistry specification for AQA GCSE Chemistry 8462.

formula

A representation of a chemical substance using symbols for its constituent elements and numbers to indicate the ratio of atoms.

symbol equation

An equation that uses chemical symbols to represent the reactants and products in a chemical reaction.

ionic equation

An equation that shows the ions involved in a chemical reaction, indicating the charge and the species present.

half equation

An equation that shows either the oxidation or reduction process in a chemical reaction, focusing on the transfer of electrons.

mixture

A combination of two or more elements or compounds that are not chemically combined.

chemical properties

Characteristics of a substance that remain unchanged when it is part of a mixture.

mixture

A combination of two or more elements or compounds that are not chemically combined.

chemical properties

Characteristics of a substance that remain unchanged when mixed with other substances.

filtration

A separation technique that uses a barrier to separate solid particles from a liquid or gas in a mixture.

mixture

A combination of two or more elements or compounds that are not chemically combined.

crystallisation

A separation technique used to obtain dissolved solids from a solution by forming solid crystals.

dissolved solids

Substances that have been dissolved in a solvent, forming a solution. In Mixtures, this term helps explain describe crystallisation as a separation technique for dissolved solids for AQA GCSE Chemistry 8462.