Cross word puzzle

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Across
  1. 3. The most abundant naturally occurring gas
  2. 4. Study of generalizations of arithmetic operation
  3. 5. Computers calculate numbers in what mode?
  4. 9. Another word for the CPU is
  5. 11. Triangle with two sides of the same length?
  6. 12. Unit of Power
  7. 13. Father of modern chemistry
  8. 16. Bleaching action of chlorine is by
  9. 18. A square matrix that is not invertible
Down
  1. 1. A computer virus that actively attacks an anti-virus program or programs in an effort to prevent detection is:
  2. 2. Nuclear sizes are expressed in a unit named
  3. 6. The device that measures current in a circuit
  4. 7. To arrange information numerically/alphabetically
  5. 8. The first graphical browser for the WWW was named
  6. 10. A measure of speed in a given direction
  7. 14. The heaviest metal
  8. 15. The set of its possible inputs
  9. 17. Most abundant element in earth crust
  10. 18. Well defined collection of distinct objects