Across
- 6. Metals the most reactive of all metals don't occur in nature in their element form
- 8. Mass composed mostly of protons and nuetrons in the nucleus also know as mass number
- 9. Elements most familiar metals because the often occur in nature uncombined
- 10. Dot Diagram uses the element symbol and dots to represent outer energy level
- 12. substance made up of atoms with the same identity
- 13. horizontal row of elements that contain increasing numbers of proton and elements
- 14. G.J Moseley arranged elements by atomic number and is what we use today
Down
- 1. good conductors of heat and electricity
- 2. Earth Metals shiny,ductile and malleable combine readily with others elements
- 3. table table were elements are organized by increasing atomic number
- 4. a type of matter with a fix comositin that cannot be separated by phsical mean
- 5. Mendeleev devised first periodic table based on atomic mass
- 7. vertical columns of elements with similar properties numbered 1-18
- 11. atoms of two or more element combiined