Two-lettered crosswords

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Across
  1. 2. Periodic notation for aluminum.
  2. 4. The word "is" used after the pronoun "I".
  3. 6. Periodic notation for gold.
  4. 8. A transdescental number that is the circumference over diameter of a circle.
  5. 10. Opposite of "yes".
  6. 12. A greeting term for "hello".
  7. 14. A preposition meaning "towards".
Down
  1. 1. Short for "father".
  2. 3. The sixth solfege in a C Major scale.
  3. 5. Short for "mother".
  4. 7. A direction pointing above.
  5. 9. Located within
  6. 11. Indicating that someone has just realized something.
  7. 13. A pronoun for something non-human.
  8. 15. Indicating one of many.