An element is a substance with only one type of ____. A compound is made of two or more ____, chemically ____ together. A mixture may contain elements or compounds, which can be ____. An atom is made of ____ kinds of particles. The centre of the atom contains the ____ which has positive ____ and ____ neutrons. The negatively charged particles are called ____ and they orbit the outside of the atom in electron ____. There are two numbers with each element on the periodic table. The smaller number is called the atomic ____ and is the number of ____ in the ____. There will be the same number of ____ as protons in a neutral atom. The larger number is the atomic ____ which is the same as the number of protons and ____ added together. Sometimes atoms of the same element have different numbers of ____. This means they have a different atomic ____, but their atomic ____ will always be the same. These are called ____. An ion is an atom that has lost or gained ____. If the ion loses electrons, it becomes ____, and if it gains them it becomes ____.

Atomic Structure Key Definitions

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