Understanding the Atomic Model:

Actually, there are several "models" of the atom, not just one. The reason we talk about a "model," rather than about an atom directly, is because we can't really SEE an atom, so we can only guess about how it actually works inside. When our model makes sense and seems to explain what we see when we do an experiment, we say that our model is good. If our model doesn't explain what we see, then we have to change our model until it does explain what we see. Here are several models of the atom as they were developed in history:

Dalton's Model, Hard Sphere represented by a solid circle.

............ Thomson's Model, the Plum Pudding model, is a circle with positive charges distributed randomly throughout and negative charges shown in small circles, also distributed randomly like raisins in plum pudding.

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Rutherford's model, Mostly Empty Space, is a circle with the positive charges located in a tiny nucleus in the center of the atom with electrons in the rest of the space.

Bohr's model, Planetary atom, is pictured as the positive charges in the center with electrons orbiting the atom in defined circles as planets orbit the sun.

................ Quantum Mechanical Model, Electron Clouds, showing a tiny, dense nucleus with dotted circles and pear-shaped lobes representing the different orbitals in which electrons can be found. This atom is pictured with a fuzzier and less defined background indicating the more open and less defined edges of the atom.

Taken from : http://chemistryiseasy.com/

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Model Atom

Understanding the Atomic Model:

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