Proton - Positively charge, Electron - Negatively charge, Neutron - No charge, Nucleus of atom - Made of proton and neutron, Molecule - Two or more atom chemically combine, Groups - Vertical, Periods - Horizontal, Atomic number - Equal to number of proton, Metalloids - Act as metal and non metal, Metals - Most of the element in the periodic table, Oxygen - The gas we inhale, Nitrogen - Most abundant in the earth's atmosphere, Silicon - Semi metals, Mercury - Dangerous element, Calcium - For our bones and teeth,

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