periodic table - a diagram that shows all known elements, atomic number - the number of protons in an element's nucleus, mass number - the average number of protons and neutrons in an element's nucleus, isotopes - atoms with the same number of protons but different numbers of neutrons, period - a row of elements on the periodic table, group - a column of elements on the periodic table, metals - a collection of grey, shiny, malleable elements, non-metals - a collection of elements with many different properties, malleable - able to bend without snapping,

Material world - periodic table

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