pertains vocab

4. group 2 elements not as reactive as group 1
7. the smallest unit of an element that maintains the properties of that element
8. Positively charged particle in the nucleus of an atom
9. Number The total number of protons and neutrons in an atom's nucleus
10. table A chart of all chemical elements currently known, orga- nized by their properties.
13. pure substance that consists entirely of one type of atom

1. Found along the 'staircase'. Have properties of both met- als and nonmetals
2. brittle , dull, poor conductors of heat and electricity; located on the right side of the periodic table
3. Metals Group 1 elements (except Hydrogen) - most reactive met- als on the periodic table
5. groups 3-12 located in the middle of the periodic table
6. Number The number of protons in the nucleus of an atom of an element
11. A subatomic particle that is neutral and that is found in the nucleus of an atom
12. A tiny, negatively charged particle that moves around the nucleus of an atom.