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...Periodic table http www lenntech com chart htm of elem ents metals select element semi conductors non inert gasses lanthanides en actinides each chemical contains a link to page that explains its properties health effects environmental application data an image and also information the history inventor iii iv v vi vii viii h choose elements by name atomic number symbol mass he li be b c n o f ne click here for na mg al si p s cl ar k ca sc ti cr mn fe co ni cu zn ga ge as se br kr rb sr y zr nb mo tc ru rh pd ag cd in sn sb te i xe cs ba la hf ta w re os ir pt au hg tl pb bi po at rn fr ra ac rf db sg bh hs mt ds uuu uub uut uuq uup uuh uus uuo ce pr nd pm sm eu gd tb dy ho er tm yb lu th pa u np pu am cm bk cf es fm md no lr interactive printable extended version m endeleiev who invented above picture system is need download just on ent schools universities please tell chem istry students teachers professors feel free reference with citation educational purposes...