Vocab Crossword Puzzle for Lesson 2.1 - Nikki

123456789
Across
  1. 3. Particles with no charge.
  2. 5. Atoms with the same number of protons and different numbers of neutrons.
  3. 6. The sum of the protons and neutrons in the atom.
  4. 7. Negatively charged particles.
  5. 8. The smallest particle that can still be considered an element.
  6. 9. A supposition or a system of ideas intended to explain something, especially one based on general principles independent of the thing to be explained.
Down
  1. 1. Positively charged particles in an atom’s nucleus.
  2. 2. A positive charge at the center of an atom.
  3. 4. The number of protons in the nucleus.