Science Review :)

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Across
  1. 5. Substances present at the start of a chemical reaction are called
  2. 7. Which particle controls "chemical properties" = bonding/reacting with other atoms?
  3. 9. Group 7?
  4. 11. more energy is used to break bonds in reactants than is released when bonds form in products. These reactions absorb energy from the environment.
Down
  1. 1. the type of reaction of burning fuel to release energy
  2. 2. a pure substance consisting only of atoms that all have the same numbers of protons in their atomic nuclei
  3. 3. When an atom donates or accepts an electron(s), this forms
  4. 4. The smallest particle into which an element can be divided and still be the same substance is
  5. 6. a _________ reaction is when reactants combine/react to give you products, as chemical bonds break and form.
  6. 8. Which subatomic particle has a neutral charge?
  7. 10. The horizontal row on the periodic table is called