The Atom. From Philosophical Idea to Scientific Theory. Dalton’s Model of the Atom. Solid sphere: Solid indivisible sphere. Dalton’s Atomic Theory. 1. All matter is composed of extremely small particles called atoms.
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From Philosophical Idea to Scientific Theory
1. Atoms are divisible even into smaller particles
2. A given element can have atoms with different masses
Current passed through tube surface of the tube directly opposite the cathode glowed
Hypothesized glow caused by a stream of particles, which they called a cathode ray
Showed that the electron has a very large charge for its tiny mass
Rutherford suggested that the electrons surrounded the nucleus like planets around the sun but did not know what kept the electrons in motion around the nucleus
AVERAGE ATOMIC WEIGHT
MassAverage atomic mass