Across
- 3. The Greek name of atoms according to Democritus, meaning uncuttable.
- 7. Two or more atoms connected together.
- 9. At that time, people believed more in his theory than that of Democritus.
- 10. These are anything that has mass and takes up space.
- 12. Negatively charged particles that orbit the nucleus in electron clouds or shells.
- 13. he developed the theory of atomism, and considered the "best guess in antiquity".
- 14. The heart of the atoms, it's the center where all the mass of the atom is concentrated.
Down
- 1. Positively charged particles located in the atom's nucleus.
- 2. He publish the Atomic Theory, He based his theory on experimentalevidence, not on lucky guesses.
- 4. are atoms of the same element that have the same number of protons (atomic number) but differ in the number of neutrons.
- 5. He thought that matter is made up of four elements: earth,fire, air and water.
- 6. Neutral (uncharged) particles also found in the nucleus. They contribute to an atom's mass but not its charge.
- 8. Democritus based his idea about atom, by cutting this, you will reach a point that you cannot cut it into smaller pieces.
- 9. the basic building blocks of matter, the incredibly tiny particles that make up everything you see and touch, except energy.
- 11. Atoms are separated from one another by vacumm and emptiness,