History Atomic Model

This is a picture of the

• Rutherford Model of atom

• Bohr Model of atom

• Dalton Model of atom

• Modern Model of atom

A small positive core with small negative particles circling it.

• Description of Bohr Model

• Description of Rutherford Model

• Description of Thompson Model

• Description of Modern Model

Experiment that showed atoms contained particles that were negatively charged.

• Cathode Ray

• Gold Foil

• Oil Drop

• Particle accelerator

Experiment that identified quantified charge of an electron

• Cathode Ray

• Gold Foil

• Oil Drop

• Particle accelerator

Distance of closest approach is

• proportional to square of angle of deflection

• proportional to angle of deflection

• inversely proportional to square of angle of deflection

• inversely proportional to angle of deflection

Distance of closest approach can be calculated using

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Millikan's experiment used the following relationship

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Atomic mass of an element is

• the number of electrons

• the number of protons in the nucleus

• the number of neutrons in the nucleus

• the number of protons plus the number of neutrons

The atomic mass of an element is

• the number of electrons

• the number of protons in the nucleus

• the number of neutrons in the nucleus

• the number of protons plus the number of neutrons on the nucleus

An isotope

• is an element that has the same number of electrons but different number of protons

• is an element that has the same number of electrons but different number of neutrons

• is an element that has the same number of protons but different number of neutrons

• is an element that has the same number of protons but different number of electrons