Matter Models

Subatomic particles with a negative charge

• Electrons

• Neutrons

• Protons

• Quarks

Subatomic particles with a positive charge

• neutrons
• atomic mass
• protons
• isotopes

These are found in the nucleus and have a neutral charge.

• proton

• electron

• neutron

Which subatomic particles are found in the nucleus of an atom?

• Protons and Electrons
• Protons and Neutrons
• Neutrons and Electrons
• Protons, Neutrons and Electrons

The Plum Pudding model was developed after J.J. Thompson discovered electrons, a particle smaller than an atom. It shows electrons floating freely in a positive region.

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This is the most complete and current model of the atom. Electrons are located in a cloud.

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Which model shows the Rutherford Model? This model was the first to show a nucleus, consisting of protons and neutrons. Electrons surround the nucleus but are not shown in distinct energy levels.

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Ernest Rutherford's gold foil experiment helped him discover that atoms were mostly _________________.

• negatively charged

• positively charged

• electrons

• empty space

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This model added on to previous models by showing electrons existed at certain "energy levels."

• The "Bohr Model" of the atom
• The "Rutherford Model" of the atom
• The "Plumb Pudding Model" of the atom
• The "Quantum Mechanical Model" of the atom