The Model of the Atom

What contribution did John Dalton make to the 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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NGSS.HS-PS1-7

Place the following scientists in order, from earliest to latest: A) Ernest Rutherford; B) J.J. Thomson; C) John Dalton

• B, C, A
• C, A, B
• A, C, B
• C, B, A

The majority of an atom's mass exists where?

• In the nucleus
• In the electron cloud
• In the space between the nucleus and the electrons
• In the neutrons

Tags

NGSS.HS-PS1-8

What are electrons?

• Positively charged particles
• Neutrally charged particles
• Negatively charged particles
• Uncharged particles

Ernest Rutherford discovered that atoms were mostly:

• Negatively charged
• Positively charged
• Electrons
• Empty space

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

Ernest Rutherford proposed which model of the atom?

• The Plum Pudding Model

• The Planetary Model

• The Quantum Model

• The Bohr Model

Which scientist proposed a new model of the atom after the discovery of the electron in 1897? His model consisted of electrons embedded in a sea of positive charge like seeds in a watermelon.

• J.J. Thomson

• Ernest Rutherford

• Niels Bohr

• Albert Einstein

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 "Planetary Model" of the atom

• The "Rutherford Model" of the atom

• The "Plumb Pudding Model" of the atom

• The "Standard Model" of the atom

During the thin foil experiment, it was seen that a______of alpha particles passed through the thin foil because the atom__________.

• majority; was dense
• few; was mostly empty space
• majority; was mostly empty space
• few; was dense