atomic models

democritus atomic model

• HE SAID THAT THE SMALLEST PARTICLE OF MATTER WAS THE ATOM

dalton´s atomic model

• In 1806
• all matter is made up of atoms
• atoms are indivisible and indestructible - atoms are not idivisible because they have smaller particles (protons and electrons)
• all atoms of a given element are identical in mass and properties - an element can have atoms with different masses
• an element can have different types of atoms
• compounds (atoms) are made up of two or more different atoms
• chemical reactions hae an arrangement in atoms, but it doesn´t change them
• THIS THEORY WASN´T TRUE

thomson´s atomic model

• In 1904
• He said that the atom was a positively charged sphere, with eectrons embedded on it. The charge was neutral. This model is known as the plum pudding model.

rutherford´s atomic model

• He said that the positive charge of atoms was concentrated in the center (the nucleus). He also said that the negative charge of the atom (electrons), was moving around the nucleus, attached to it by electrical atraction

bohr´s atomic model

• He refined rutherford´s idea by adding that electorns move in shells. These shells can have a máximum number of protons.