Periodic Table

4. METALS First group (vertical column) in the periodic table, most reactive of all metals.
6. URANIUM ELEMENTS Elements with atomic number greater than Uranium (92)
9. ELEMENT Metal that emits Alpha, Beta or gamma particles.
10. EARTH METALS 2nd group (Vertical Column) in the periodic table, 2nd most reactive metals.
15. DOT DIAGRAM a representation of the valence electrons of an atom that uses dots around the symbol of the element. The number of dots equals the number of valence electrons in the atom.
16. a material that, when freshly prepared, polished, or fractured, shows a lustrous appearance, and conducts electricity and heat relatively well.
17. Substance that can be drawn into wires.
20. materials which have a conductivity between conductors (generally metals) and nonconductors or insulators
22. horizontal row in the periodic table having elements with the same # of energy levels.

1. MOLECULE Molecule made up of two atoms
2. ELECTRON Electrons in the outermost energy level of an atom.
3. TABLE A table of elements arranged in the order of their atomic numbers and arranged in groups and periods.
5. Substance that can be beaten into sheets.
7. An element (e.g. arsenic, antimony, or tin) whose properties are intermediate between those of metals and solid nonmetals or semiconductors.
8. 17th column elements of the periodic table; most reactive of all nonmetals
11. Elements that are located to the right of the periodic table, typically poor conductors of heat and electricity.
12. GASES 18th or the rightmost column of elements in the periodic table and are very un-reactive.
13. BONDING Electrostatic force of attraction between two metallic atoms
14. ELEMENTS Elements between the representative elements; 3rd to 12th column.
18. Two or more different physical forms of a element.
19. Atomic mass unit: Unit to measure the relative mass of atoms and molecules.
21. Vertical columns in the periodic table holding elements with the same # of valence electrons