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Across 2. Elements that occur in a vertical column on the periodic table; also called a family 5. Has mass and takes up space. 8. It is what is being dissolved. 12. A Russian scientist who discovered a set of patterns that applied to the elements 14. The smallest unit of matter that retains the identity of the substance 15. region surrounding the nucleus of an atom where electrons are most likely to be found 17. The unit that we are learning about and it is the study of the properties of matter and how matter changes. Come on I know you can do it! 18. Elements that occur in a horizontal row on the periodic table 19. An element above and to the right of the stair-step line of metalloids 20. Transform from one form to another

Down 1. An element below and to the left of the stair-step line of metalloids; about 80% of the known elements are metals 3. subatomic particle with a positive charge and located in the nucleus of the atom 4. It is what is doing the dissolving. 6. Elements in groups 3-12, most are hard and shiny and are good conductors of electricity 7. A substance that cannot be broken down into simpler substances by ordinary chemical means 9. The ability to dissolve. 10. An element with properties of both metals and nonmetals located along the stair-step line on the right side of the periodic table 11. An arrangement of elements in order of increasing atomic numbers that demonstrates the periodic patterns that occur among the elements 13. the central part of the atom containing protons and neutrons. 16. subatomic particle with no charge, the same mass as a proton, and located in the nucleus of the atom