Across
- 5. Elements are organized on this table, based on similar properties!
- 6. This is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes. (Hint: this is the quantity of matter contained in an atom of an element.)
- 9. This is a particle of an atom that has a (+) positive charge.
- 10. This is the center of an atom.
- 12. The _______ of an element tells you the number of atoms in the molecule.
- 13. This is a particle of an atom that has a (-) negative charge.
- 14. Each horizontal row of the Periodic Table is called this.
- 15. The _______ which surround some groups of atoms indicate that the numbers of all of the atoms inside the bracket need to be multiplied by the coefficient.
Down
- 1. The columns of the Periodic Table is called this.
- 2. This force holds atoms together!
- 3. This is a particle of an atom that has no charge.
- 4. The basic building blocks of all matter.
- 7. This chemical element with the symbol 'C' is used for fuel in the form of coal, and more!
- 8. This is the number of protons in the nucleus of an atom, which determines the chemical properties of an element. (Hint: located above the element symbol.)
- 11. This person devised the periodic classification of the chemical elements, in which the elements were arranged in order of increasing atomic weight.