Chemistry ;)

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Across
  1. 1. covalent bond atoms with different electronegativities share electrons in a covalent bond
  2. 3. combines two or more elements
  3. 8. pure substances that cannot be broken down into simpler substances
  4. 9. an atoms attractiveness to electrons
Down
  1. 1. the process by which green plants and some other organisms use sunlight to synthesize foods
  2. 2. smallest unit of matter that retains properties of an element
  3. 4. covalent bond the bonding electrons are shared equally between the two atoms
  4. 5. bond the force that holds atoms together in a chemical compound.
  5. 6. the central and most important part of an object
  6. 7. combined with Oxygen and Hydrogen