Across
- 2. This part of the atom is negatively charged.
- 3. In order to be considered matter, the substance has mass and ________________.
- 6. The center of the atom is called the __________.
- 7. The atomic number of a periodic square tells you how many ___________ there are in the atom.
Down
- 1. All matter can be broken down into this small, basic building block.
- 4. This is the 8th element of the periodic table.
- 5. This element has the atomic symbol "Ne."