Across
- 2. Type of electromagnetic radiation that can be perceived by the human eye.
- 5. Name that is the reference for the value of the mole.
- 8. Has two shells and the same number of valence electrons of chlorine.
- 10. Protons and neutrons particles.
- 11. Has a greenish light with the flame test.
- 13. Father of modern chemistry.
- 17. Level of energy when electrons orbit.
- 18. Every element has a specific mass as a signature.
- 20. Electrons located on the outermost shell
- 23. Variant of a same element.
Down
- 1. Discovered the positive nucleus in the atom.
- 3. Unit that represents a large set of particles.
- 4. An unstable isotope that will start a chain reaction.
- 6. First known as "better air".
- 7. Radiation that shows the highest level of energy on the spectrum.
- 9. Electrons located on the first shell(s) but not the last one.
- 12. An old concept that was believed to be a fluid taken or added during combustion.
- 14. From its Latin origin "Aurum"
- 15. Radiation that shows the lowest level of energy on the spectrum.
- 16. Has a mass of 56 amu.
- 19. Has two shells of energy and only four valence electrons.
- 21. Isotope of hydrogen with an extra two neutrons
- 22. Discover the levels of energy for the electrons.