Across
- 2. The building blocks of all matter
- 5. The _____ is made up of protons and neutrons.
- 6. The smallest subatomic particle. Contains a negative charge.
- 7. The neutral subatomic particle. Can be found inside of the nucleus.
Down
- 1. Positively charged subatomic particle. Can be found inside of the nucleus of an atom.
- 3. The place outside of the nucleus is filled with electrons and empty _____.
- 4. To find the number of neutrons, you would ______ the atomic mass and the atomic number.
- 8. The protons and electrons are _____ in number in mostly all atoms.