Atom and Periodic table

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Across
  1. 1. Positively charged subatomic particle found in the center of the nucleus
  2. 6. Mainly found on the left side of the periodic table
  3. 7. What have the same number of outermost electrons?
  4. 9. Total number of proton and electron
  5. 13. What are rows that have the same number of energy levels or energy shells?
  6. 16. The centre of an atom
  7. 18. A substance consisting of items which are all same
  8. 19. gases What is group zero called?
  9. 20. Negatively charged subatomic particle found in the shells around the nucleus
  10. 21. Element in the same group have similar what?
  11. 22. The smallest particle of a chemical element
  12. 23. What is group seven element are called?
Down
  1. 2. Mainly found on the right side of the periodic table?
  2. 3. Electrons living where?
  3. 4. Same number of protons but different numbers of neutrons
  4. 5. metals What is group one element called?
  5. 8. What is same as proton and electron
  6. 10. A stbstance contaning two or more elements which are chemically combined
  7. 11. Electrically neutral subatomic particle found in the nucleus
  8. 12. Two or more atoms held together by covalent bonds
  9. 14. Isotopes have the same chemical properties because they have the same number of what?
  10. 15. The arrangement of electron is also known as what?
  11. 17. A substance containing two or more elements which are not chemical combined