Happy Monday!

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Across
  1. 2. how many seats are free in my outer shells
  2. 4. S x T
  3. 6. when we bond we share electrons
  4. 8. I am the mother of all energies
  5. 9. A study of how things work
  6. 12. we share same atomic number but different neutrons
  7. 15. i make things stop from being in endless motion
  8. 16. i use it to push or pull something
  9. 17. we have same atomic mass but different atomic numbers
  10. 19. I x R
Down
  1. 1. v-u/t final - initial/time
  2. 3. A Study of what things are made up of
  3. 5. my atomic number is the no of days in feb in a leap year
  4. 7. there are three laws for me that newton made
  5. 10. we loose electron and we become positively charged
  6. 11. i am a vector and related to speed
  7. 13. ph level of these are very low
  8. 14. more of me makes needs more force to be applied
  9. 18. we gain electron and become negatively charged