What is matter? Does it matter?

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Across
  1. 1. Indicates acidity and alkalinity
  2. 3. Number of protons in an atom’s nucleus it it's
  3. 4. two types unite atoms into groupings such as crystals and molecules and this is called a chemical ____?
  4. 6. consists of protons, neutrons and electrons
  5. 9. A substance that cannot be broken down into two or more different substances
  6. 10. negatively charged found on the peripheral cloud
  7. 14. interaction between two atoms that occurs as a result of activity between electrons in their outermost energy levels is called a chemical ____?
  8. 15. Type of compound that does not have Carbon in it.
  9. 16. Compound that results from the chemical interaction of an acid and a base
  10. 17. consists of groupings of atoms of two or more elements
  11. 18. Two or more atoms covalently joined together
Down
  1. 2. Which type of bond forms when electrons are unequally shared?
  2. 3. neutral/no charge in the nucleus
  3. 5. anything that occupies space and has mass
  4. 7. positively charged in the nucleus
  5. 8. Involve the formation or breaking of bonds.
  6. 11. Atoms with fewer or more than 8 electrons in the outer energy level will attempt to loose, gain, or share electrons with other atoms to achieve stability. Is what rule...?
  7. 12. Any substance that releases a Hydrogen ion (H+) when in a solution
  8. 13. _____ of an element contain the same number of protons but different number of neutrons?
  9. 18. Mass of a single element is its atomic...?