Across
- 1. an atom with less electrons than protons
- 4. atomic mass unit
- 6. any of the series of fifteen metallic elements from lanthanum to lutetium
- 10. the emission of ionizing radiation caused by the disintegration of a nucleus
- 12. particles with a negative charge
- 13. when an atom has more or less neutrons than protons
- 14. an atom with more electrons than protons
- 16. when a nucleus loses energy due to radiation
- 17. particles with no charge
- 18. center of an atom
- 19. particles with a positive charge
- 20. any of the elements helium, neon, argon, krypton, xenon, and radon,
- 22. when an atom gains or loses an electron
- 23. reactive to water
- 24. a column of elements on the periodic table
Down
- 2. any metals occupying the central block of the PTE, ex:copper
- 3. an element that behaves like both a metal and non metal
- 5. a row of elements on the periodic table
- 7. all possible places for an electron to be
- 8. fifteen radioactive elements from actinium to lawrencium
- 9. an element that is not metal
- 11. any of the elements fluorine, chlorine, bromine, iodine, and astatin
- 15. a material that is malleable and conductes electricity
- 21. the number of protons in an element
- 23. lithium, sodium, potassium, rubidium, cesium, and francium,