Atomic Theory

Who was the first person to ever talk about the atom?

• Dalton
• Rutherford
• Democritus

All matter is made of what?

• energy
• electrons
• atoms
• compounds

Tags

NGSS.MS-PS1-1

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How did Rutherford discover the proton?

• Cathode Ray Tube
• Gold Foil Experiment
• Planetary Model
• Plum Pudding Model

Who stated that all atoms of the same element are exactly alike?

• Democritus
• Dalton
• Thomson
• Bohr

What scientist is best known for his "Plum Pudding" model of the atom?

• J. J. Thomson
• Ernest Rutherford
• John Dalton
• Democritus

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 the nucleus in an atom.
• He discovered that atoms could be divided into smaller parts.

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Rutherford's gold foil experiment provided evidence that.....

• negative and positive charges are spread out evenly throughout the atom.
• alpha particles have a positive charge.
• gold is not as dense as previously thought.
• there is a dense positively charged nucleus at the center of an atom.

True or False: The majority of an atom is made up of empty space

• True
• False

The middle of the atom, which contains protons and neutrons, is called ___________

• the shell
• the nucleus
• the cell
• the control center

Tags

NGSS.HS-PS1-8

Bohr's model of the atom proposed that ______.

• the nucleus spins
• neutrons move around the nucleus
• electrons move around the nucleus in levels
• neutrons do not exist, but are just paired protons and electrons