Atomic Theory
Across
- 6. The "center" of an atom in which scientists expect to find protons and neutrons, but not electrons
- 9. Dmitri Ivanovich Mendeleev formulated the Periodic Law, leading to the creation of this important document used by scientists around the world
- 10. Particles that make up an atom including protons, neutrons, and electrons
- 11. One of more then 110- known fundamental building blocks of matter - these particles cannot be broken down by chemical means
- 14. This number tells you the valence electrons of an elements on the periodic table
- 15. The location of electrons in an atom
- 16. A minute portion of matter; an individual unit of matter that could be anything from an atom to a planet depending upon established parameters
- 17. He laid the foundation for modern atomic theory
- 19. A neutral subatomic particle located in the nucleus of an atom, having a mass of 1 AMU and serving to "bind" the nucleus together
Down
- 1. This scientist conducted the Gold Foil Experiment, which proved that atoms contain a nucleus and are largely made up of empty space
- 2. Electrons in the outermost shell
- 3. Created the modern model of the atom
- 4. Equivalent to the number of protons
- 5. The sum of protons and neutrons
- 7. A group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
- 8. This scientists concluded that electrons sat in the positively charged atom
- 9. A positively-charged subatomic particle having a mass of 1 AMU and located in the nucleus of an atom
- 12. A negatively charged particle found outside of the nucleus of an atom
- 13. This number tells you the energy level of an element on the periodic table
- 18. The basic unit of a chemical elements
- 19. This scientist created a model of the atom similar to planets orbiting a star. The nucleus was the star, and the planets were the orbitals