periodic table  - chart that list the elements based on the structure of their atoms, atomic number  - the periodic table is organized, Atomic number  - The numbers of protons in the nucleus, Dimitri Mendeleev - invented the Periodic Table, Metals - It can be melted and is conductor of electricity and heat, Non metals  - A substance that doesn’t have metallic properties, Metalloid - A substance that shares some characteristics of metal and some of nonmetal, Periods - The rows of the periodic table, Groups - The columns of the periodic table , 7 - Number of periods that periodic table has, 18 - Number of Groups Number of groups that periodic table has has the periodic table , Alkali metals - They react with water, noble gases - These are colourless, odourless, tasteless, nonflammable gases, Halogen - These are very reactive with sodium,

Periodic table

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