Periodic Table

2. the state or power of being reactive or the degree to which a thing is reactive.
5. an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
6. group 1 of the periodic table.
9. a negatively charged ion.
10. group 18 of the periodic table.
12. group 2 of the periodic table.
15. distance from the nucleus to the boundary of the surrounding cloud of electrons.
16. an element or substance that is not a metal.
17. a positively charged ion.
18. a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity.

1. the principle that chemical properties of the elements are periodic functions of their atomic numbers.
3. the set of chemical properties that are associated with the elements classified as metals in the periodic table.
4. an element whose properties are intermediate between those of metals and solid nonmetals.
7. the amount of energy released when an electron is added to a neutral atom or molecule to form a negative ion.
8. the amount of energy required to remove an electron from the atom.
11. the tendency of an atom to attract electrons in the formation of an ionic bond.
13. groups 4-12 of the periodic table.
14. group 17 of the periodic table.