Cross word puzzle

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