Simple Machines
Across
- 3. Where the electrons float around the nucleus.
- 4. Element with atomic number 8.
- 5. The property in which the periodic table is currently organized.
- 11. Number of electrons in the first shell of the electron cloud.
- 12. There are only 17 of these on the periodic table but are essential for life.
- 16. The process of an atom losing energy
- 17. The building block of matter.
- 19. Atoms with the same number of protons with differing numbers of neutrons.
- 20. There are 7 rows or ___________ on the modern periodic table.
- 21. After the first shell, each electron shell can hold this number of electrons.
Down
- 1. The electrons are the ___________ particles found in the atom.
- 2. The two subatomic particles that make up the majority of an atom's mass.
- 6. Created the first periodic table.
- 7. a term used for nonmetals that are easily broken.
- 8. Original property that Mendeleev used to organize the elements.
- 9. Where the protons and neutrons are located in the atom.
- 10. The amount of time it takes for half of a sample of an element to decay.
- 13. Found in the nucleus with the protons.
- 14. a term used for metals that can be hammered or reshaped without breaking.
- 15. Positively charge subatomic particles
- 18. Adding protons and neutrons together gives you the atom's _______ number.
- 22. There are 18 columns or _________ on the modern periodic table.