Across
- 5. Positively charged and resides in the nucleus of an atom
- 7. each of two or more forms of the same element that contain equal numbers of protons
- 8. Rows of the periodic table of elements
- 9. negatively charged and resides in the electronic cloud
- 10. A group of atoms, usually but not always representing more than one element, joined by chemical bonds
- 13. A phenomenon whereby certain isotopes known as radioisotopes are subject to a form of decay brought about by the emission of high-energy particles
- 15. each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances
- 16. The last element on the periodic table
- 17. The first name of the person who made the periodic table
- 19. symbol The number of protons in the nucleus of an atom
Down
- 1. The number of protons in the nucleus of an atom
- 2. The first element on the periodic table
- 3. A pattern of probabilities regarding the regions that an electron can occupy within an atom in a particular energy state
- 4. A substance made of two or more elements that have bonded chemically
- 5. Rows of the periodic table of elements
- 6. Neutral and resides in the nucleus of an atom
- 11. Columns on the periodic table of elements
- 12. The last name of the person who made the periodic table
- 14. an atom or molecule with a net electric charge
- 18. A group of atoms, usually but not always representing more than one element, joined by chemical bonds