Across
- 3. something that occupies space and has mass
- 6. smallest part of molecule
- 9. magnesium+nitrate
- 11. outermost has 8 electrons then it is ________
Down
- 1. smallest part of element
- 2. no.of electrons in the outer shell
- 4. ________ are building blocks of matter
- 5. _________________arrangements of matter.
- 7. protons+neutrons
- 8. iron+sulphate
- 10. _________ is formed when hydrogen combines with oxygen.