Across
- 3. This scientist coined the term "ALL MATTER IS MADE OF ATOMS.
- 4. It's affects the form or state of a substance, but not it's identity.
- 5. This happened 13.8 billion years ago.
- 8. Elements heavier than iron cannot form through normal fusion it requires too much energy.
- 9. A neutral subatomic particle located in the nucleus of an atom, with no electric charge (charge 0) and a mass slightly greater than that of a proton.
- 10. It refers to the atom's total number of protons and neutrons, represented by the symbol A.
Down
- 1. The number of protons in the atom and represented by the symbol Z. - atomic number
- 2. This results in the formation of a new subtance with different properties.
- 6. A subatomic particle found in the nucleus of an atom that carries a positive electric charge of +1 elementary charge.
- 7. Greek philosopher Democritus proposed that all matter is composed of tiny, invisible particles called atomos.