Periodic table
118
how many elements are on the periodic table?
helium
what was the first element
a burning candle is a chemical reaction
give me an example of a chemical reaction
nail polish
what is tolune used for
mostly extracted from rocks
were is lithium found
metals, liquids and gas
how is the periodic table devided
organeeson
what was the most recent element discovered
combanation reaction
what is a cause for a physical reaction
just matter
what are chemicals made of
fossil fules
were does helium come from
dimitri Mendellev
who created the periodic table
Hennig brand
who discovered the first element
when this happens some signs will be a change in color or shape but can still be switched back
what are signs of chemical reactions
NaCLO
what is the chemical formula for bleach
in the atmosphere
were is oxygen found
1869
when was the periodic table made
1774
when was the element oxygen discovered
signs of this are change in color or the product itself
what are signs of a chemical reaction
1808
when was potasium discovered
in various minarals
were is potasium found
hydrogen
what is one of the most important elements on the periodic table
1999
when was the last element found
when this happens the susbstance can not be changed back
can a chemical reaction be reversed
1817
when was lithium discovered
compounds
how are most elements formed