Chemistry

123456789101112
Across
  1. 2. Release of heat
  2. 4. A measurement of acidity
  3. 6. Molecule composed of two atoms
  4. 8. Absorption of heat
  5. 11. A chemical bond that shares electrons
  6. 12. A negatively charged ion
Down
  1. 1. - two or more atoms in a covalent bond
  2. 3. An orbit of electrons around an atoms nucleus
  3. 5. An electron in the outer shell of an atom
  4. 7. A group of atoms bonded together
  5. 9. Hydrogen and carbon
  6. 10. A positively charged ion