This was the first model of the atom ever proposed. It was simple and described atoms as tiny spheres that could not be broken down into smaller pieces.

• Democritus's model of the atom
• The "Plum Pudding Model" of the atom
• The "Rutherford Model" of the atom
• The "Solar System Model" of the atom

This model was developed after J.J. Thompson discovered electrons, a particle smaller than an atom. Is shows electrons floating freely in a positive space.

• The "Plum Pudding Model" of the atom
• The "Rutherford Model" of the atom
• Democritus's model of the atom
• The "Solar System Model" of the atom

This model added on to previous models by showing electrons existed at certain "energy levels". However is does not accurately show what those levels look like.

• The "Solar System Model" of the atom
• The "Rutherford Model" of the atom
• The "Plumb Pudding Model" of the atom
• The "Standard Model" of the atom

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What sub-atomic particle is this?
In the Nucleus
Positively Charged
Mass of 1 amu

• proton
• electron
• nutron 

What sub-atomic particle is this?
Outside the Nucleus
Negatively Charged
Mass of 1/1000 amu

• proton
• electron
• neutron

What sub-atomic particle is this?
NeutronIn the Nucleus
No Charge
Mass of 1 amu

• proton
• electron
• neutron

What is the atomic number of Chlorine (Cl)?

• 17
• Cl
• 35.453
• Chlorine

Tags

NGSS.HS-PS1-1

The number of protons and electrons are the same as

• Atomic number
• Neutrons
• atomic mass
• Electron shells

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NGSS.HS-PS1-1

What contribution did John Dalton make to atomic theory? 

• He discovered that every atom was positively charged. 
• He discovered that every element consisted of one type of atom.  
• He discovered that atoms had nuclei. 
• He discovered that atoms could be divided into smaller parts. 

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Ernest Rutherford discovered that atoms were mostly _________________. 

• negatively charged
• positively charged
• electrons
• empty space.