Atomic theory

2. Atomic theory originated as a philosophical concept in ancient
4. He found that the positive charge of an atom and most of its mass were at the center, or nucleus, of an atom
5. a person whom His oral presentation (1803) and publication (1805) marked the beginning of the scientific atomic theory.
6. The word "atom" comes from the ancient Greek word
8. an atomic theory in which atoms consist of smaller particles.
9. a person who proposed that matter consists of indestructible, indivisible units called atoms

1. According to his model, electrons couldn't spiral into the nucleus but could make quantum leaps between energy levels.
3. a unit carried a negative charge
6. scientific theory of the nature of atoms
7. tiny particle of matter