ATOMS PROJECT CKS ATOMISM Atomism is the theory that all the objects in the universe are composed of very small, indestructible building blocks. Atomism.

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Presentation transcript:

ATOMS PROJECT CKS

ATOMISM Atomism is the theory that all the objects in the universe are composed of very small, indestructible building blocks. Atomism is the theory that all the objects in the universe are composed of very small, indestructible building blocks.

Atomism Democritus and Leucippus taught that the hidden substance in all physical objects consists of different arrangements of atoms. Democritus is given credit for the discovery of the model of atomism. Democritus and Leucippus taught that the hidden substance in all physical objects consists of different arrangements of atoms. Democritus is given credit for the discovery of the model of atomism.

Earth, Wind, Fire, and Water Aristotle came up with the idea that there were four different types of atoms. They were earth, wind, fire, and water. Aristotle came up with the idea that there were four different types of atoms. They were earth, wind, fire, and water.

Solid Sphere Model In 1803, John Dalton viewed the atom as a small solid sphere. Dalton believed that: Dalton believed that: Each element was composed of the same kind of atoms.Each element was composed of the same kind of atoms. Each element was composed of different kinds of atoms.Each element was composed of different kinds of atoms. Compounds are composed of atoms in specific ratios.Compounds are composed of atoms in specific ratios. Chemical reactions are rearrangements of atoms (mass is conserved).Chemical reactions are rearrangements of atoms (mass is conserved). He came to this conclusion by careful analysis He came to this conclusion by careful analysis

Cathode R RR Ray Experiment From observations made by J.J. Thomson in the Cathode Ray Experiment he concluded that the particles inside were all negatively charged. This led to the development of the Plum Pudding Model

THE PLUM PUDDING MODEL The plum pudding model of the atom was proposed by J. J. Thomson, who discovered the electron in Then later Thomson proposed the plum pudding model in 1904.

NUCLEAR MODEL Ernest Rutherford created the Nuclear Model, by experimenting with the Gold Foil Experiment, believing that most alpha particles passed through the foil but some of the particles bounced back

GOLD FOIL EXPERIMENT

Planetary Model The most significant properties of atomic and molecular structure may be shown using a cut down picture of an atom that is called the Bohr Model. This model was proposed by Niels Bohr in Which formally became known as the Planetary Model. The most significant properties of atomic and molecular structure may be shown using a cut down picture of an atom that is called the Bohr Model. This model was proposed by Niels Bohr in Which formally became known as the Planetary Model.

The Electron Cloud Model The electron cloud model evolved from the earlier Bohr model. In the electron cloud model, rather than following fixed orbits, electrons bound to an atom are observed more frequently in certain areas around the nucleus called orbitals. The electron cloud can change between electron orbital states, and each state has a characteristic shape and energy. The electron cloud model evolved from the earlier Bohr model. In the electron cloud model, rather than following fixed orbits, electrons bound to an atom are observed more frequently in certain areas around the nucleus called orbitals. The electron cloud can change between electron orbital states, and each state has a characteristic shape and energy.