Atomic Theory

"Everything is composed of atoms" was stated by:

• Democritis
• Dalton
• Moseley
• Einstein

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NGSS.MS-PS1-1

John Dalton stated:

• elements are made of atoms
• atoms of a given element are identical
• atoms cannot be subdivided, created, nor destroyed
• all of the above

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The scientist responsible for "discovering" the nucleus is:

• Bohr
• Rutherford
• Schroedinger
• Einstein

The nucleus of an atom can be described as:

• spacious and negatively charged
• dense and positively charged
• spacious and positively charged
• dense and negatively charged

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NGSS.HS-PS1-8

Electrons are not factored into atomic mass because:

• They are so small their mass is negligible
• They're not in the nucleus
• They're too big
• They move so quickly their mass is zero

How did Rutherford discover the proton?

• Cathode tube ray experiment
• Gold Foil Experiment
• Planetary Model
• Plum Pudding Model

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What does the nucleus of an atom contain?

• Electrons and neutrons
• Protons and neutrons
• Neutrinos and positrons
• DNA and RN

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NGSS.MS-PS1-1

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

• True
• False

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NGSS.MS-PS1-1

The word "atom" comes from a Greek word that means

• Invisible
• Indivisible
• Undivided

In an atom, electrons move in definite orbits around the nucleus.

• Thomson
• Rutherford
• Bohr
• Democritus