Chemistry

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Across
  1. 2. Bonding The Bonding of metals
  2. 6. Pb
  3. 7. Used in pencils
  4. 8. Used to make braces
Down
  1. 1. O
  2. 3. Bonding The share of electrons
  3. 4. Table The table of elements
  4. 5. A hard substance that is used in jewellery