Structure of Matter

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Across
  1. 2. Has positive charge and located in nucleus.
  2. 4. Sum of the number of proton and neutron.
  3. 6. State of matter with indefinite shape and volume.
  4. 7. Same atom with different number of neutron.
  5. 9. Composed of only one type of atoms.
  6. 11. Has neutral charge and located in nucleus.
  7. 12. State of matter with definite shape and volume.
Down
  1. 1. Top number on the periodic table that represents the number of proton.
  2. 2. State of matter that is in gas form with high temperature and electricity.
  3. 3. Composed of more than one element chemically combined.
  4. 5. Has negative charge and located outside the nucleus.
  5. 8. Building block of matter
  6. 10. State of matter with indefinite shape, but definite volume.
  7. 11. Center of atom that contains proton and neutron.