Across
- 2. Table: a table of the chemical elements arranged in order of atomic number, so that elements with similar atomic structure and hence similar chemical properties appear in vertical columns.
- 4. type of element typically brittle, non-conductive elements that lack the characteristics of metals.
- 7. any of the elements fluorine, chlorine, bromine, iodine, and astatine, occupying group 17 of the periodic table.
- 8. number: The number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
- 10. metals: Any of the elements occupying Group 1 of the periodic table. They are very reactive metals
- 11. mass: The mass of a single atom of a chemical element. It includes the masses of the 2 subatomic particles that make up an atom’s nucleus: protons and neutrons.
- 12. metals: any of the set of metallic elements occupying groups 4–12 in the periodic table
- 13. electrons: a valence electron is an outer shell electron that is associated with an atom, and that can participate in the formation of a chemical bond if the outer shell is not full.
- 14. vertical columns of the periodic table. All elements in a group have the same number of valence electrons
Down
- 1. horizontal rows of the periodic table. All elements in a row have the same number of electron shells
- 3. earth metals: any of the six highly reactive chemical elements in group 2 of the periodic table
- 5. a group of elements that act between a metal and a non-metal. Sometimes they can display metallic properties, other times they can act more like a non-metal.
- 6. type of element that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity.
- 9. rule: elements are most stable when their outer electron level is full, usually with eight electrons