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Across 1. substance that can not be broken down 6. the tiny particles 7. property of atom is determine by the number of proton 9. electron in outermost shell 11. equivalent of solute per liter of solution 14. a body of techniques for investigating (experiment) 16. element that is harder ductile and shiny 19. adding extra solvent to decrease the concentration of solution 20. how close the measurement in a series to each other 21. group of two or more substance

Down 2. the simplest ratio of atoms in a molecule 3. a person who discover an atom 4. amount of matter that contains as many object as the number of atom exactly 12.0g of carbon 5. amount of product formed based on limiting reactant 8. ratio of number of solute moles to the total number of moles 10. table that containing all element in the Earth 12. anything that has mass and occupies space 13. reaction that containing oxidation and reduction simultaneously 15. reaction that produced carbon dioxide and water 17. mole of solute per one litre of solution 18. atoms that has same proton number but different number of neutron