ATOMIC MODELS.

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Presentation transcript:

ATOMIC MODELS

1. What is matter? Matter is anything that has mass and volume. 2. What makes up matter? Atoms. 3. What is direct evidence? Evidence you get about an object by actually seeing or touching the object. 4. What is indirect evidence? Evidence you get about an object without seeing or touching the object. 5. What is a model? A model uses familiar ideas to explain unfamiliar facts observed in nature. A model can be changed as new information is collected.

Models of the Atom Greek Model Democritus concluded that matter could not be divided into smaller and smaller pieces forever. Eventually the smallest possible piece would be obtained the Atom.

Dalton Model 1.All elements are composed of atoms. Atoms are indivisible and indestructible particles. 2.Atoms of the same element are exactly alike. 3.Atoms of different elements are different. 4.Compounds are formed by the joining of atoms of 2 or more elements

THOMPSON MODEL (Plum Pudding Model) He discovered the electron and that they were negatively charged. This proved that the atom is divisible.

Rutherford Model All of an Atom’s positively charged particles were contained in the the Nucleus. The negatively charged electrons were scattered outside the nucleus around the Atom’s edge.

BOHR MODEL Electrons move in definite orbits around the nucleus much like the planets circle the sun. These orbits or energy levels are located at certain distances from the nucleus.

Modern or Wave or Cloud Model Electrons do not move about an Atom in a definite path. An Atom has a small positively charged Nucleus containing Protons and Neutrons. The Nucleus is surrounded by a large region in which there are enough electrons to make an Atom neutral.