Chemistry Crossword

7. - carry a negative charge
8. number - the number of protons in the nucleus
9. (on the P.T.) - a column of elements in the periodic table of the chemical elements
10. - a substance that takes part in and undergoes change during a reaction
13. - the opposite of "exo"
15. - material that is dull, nonmalleable, fragile
16. Bohr- suggested that electrons move from one orbital to another
18. electron - the outermost shell of an atom
19. - a group of atoms bonded together
20. - everything is made up of these
21. - substance that is formed as the result of a chemical reaction
23. - found all over the periodic table
24. - a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity

1. - the space outside the nucleus of an atom where an electron is
2. - carry a positive charge
3. - to be deposited in solid form from a solution
4. Mendeleev - a Russian chemist, developed a periodic table of the chemical elements
5. (on the P.T.) - horizontal rows in the periodic table, the same number of electron shells
6. - a thing that is composed of two or more separate elements
11. - the release of heat
12. - properties are intermediate between those of metals and solid nonmetals
14. Gas - gaseous
15. - the center of an atom
16. - carry no electrical charge
17. of Conservation of Mass - mass in an isolated system, not destroyed by chemical reactions
22. - a mark or character