Periodic table

1234567891011121314151617181920
Across
  1. 4. Particles in the nucleus with a positive charge of 1+
  2. 5. Elements that are shiny, malleable, ductile, are good conductors, and are solid at room temperature
  3. 6. The only non-metal found on the left side of the stair-step line
  4. 7. Substances that are made up of alike atoms
  5. 8. Capital letter or capital letter with 1 or 2 lowercase letters
  6. 11. Group 18
  7. 13. Rows on a periodic table
  8. 15. Line of metalloids, starting under Boron
  9. 18. Number of rings surrounding a nucleus
  10. 19. Particles in the nucleus that are electrically neutral
  11. 20. Number of protons in an element
Down
  1. 1. Columns on a periodic table
  2. 2. Smallest partical of an element that retains the element's properties
  3. 3. Group 17
  4. 9. Atoms of the same element that have different numbers of neutrons
  5. 10. The positively charged center of the atom
  6. 12. Number of protons and neutrons in a nucleus
  7. 14. Group 1
  8. 16. Number of electrons allowed in the innermost outer orbit
  9. 17. Particles with a negative charge of 1- that occupy the space around the nucleus