All materials are made up of elements
An element is a substance made up of only one type of atom.
In every element each atom has the same number of protons. In most elements, there are different variations with varying numbers of neutrons
Atoms of the same number but with different numbers of neutrons are called isotopes. Some isotopes are reactive. They decay over time and become less radioactive
Metal elements are shiny solids, good conductors of heat and non magnetic
Non-metal elements are not shiny, poor conductors of heat and non-magnetic
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