Across
- 3. 1 or 2 letters that abbreviate an element
- 4. The temperature increases
- 6. A substance that is formed when two or more chemicals react
- 7. A period is one of the horizontal rows in the periodic table, all of whose elements have the same number of electron shells
- 9. A Russian man who created the periodic table
- 11. A substance that takes part in and undergoes change during a reaction
- 16. Electrons in the outermost energy shell(Level/Orbital)
- 18. Solid, shiny, ductile, malleable, and good conductor of heat and electricity
- 19. A form of matter that may not be broken further down
- 20. A group of atoms bonded together
- 21. The mass of an atom of a chemical element expressed in atomic mass units
- 24. The central and most important part of an object
- 25. Atomic particles found in the the nucleus of an atom and carries a positive charge
Down
- 1. Atomic particles that move around the nucleus of an atom and carries a negative charge
- 2. Is a column of elements in the periodic table of the chemical elements
- 5. The temperature decreases
- 8. Brittle, not malleable or ductile, poor conductor of heat and electricity
- 10. The number of atoms on both sides of the equation must be the same
- 12. The number of Protons or Electrons in an atom
- 13. Share properties of both metals and non-metals
- 14. Regions of space outside the nucleus of an atom
- 15. Atomic particles found in the nucleus of an atom and carries no electrical charge
- 17. A rare gas that is usually radon, show great stability and have extremely low reaction rates
- 22. A thing that is composed of two or more separate elements
- 23. A substance that is made up of one type of atom