Atomic Model

How do scientists know how atoms are structured?

• By looking under a microscope
• By running experiments that expose their properties
• By examining only the largest atoms
• By splitting them apart

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What can you conclude from the fact that scientists continue to update the atomic model?

• New information about atoms continues to be discovered
• Old information about atoms is completely useless
• Scientists did not have any information about atoms until a few years ago
• Scientists still have no idea what atoms look like

What contribution did John Dalton make to atomic theory?

• he dsicovered 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

Place the following scientists in order, from earliest to latest: A) Enest Rutherford; B) J.J. Thomsonl 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

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

What does the nucleus of an atom contain?

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

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How are neutrons different from protons and electrons?

• They are massive than protons and electrons
• they have no electrical charge
• They are less massive than protons and electrons
• Protons and electrons exist in atomic nuclei; neutrons orbit the nucleus in a "cloud"

How are electrons arranged?

• In groups of five
• In energy levels
• By color
• By shape

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