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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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What are the 3 particles that make-up the atom?

• Protons, neutrons, and isotopes
• Neutrons, isotopes, and electrons
• Positives, negatives, and electrons
• Protons, neutrons, and electrons

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Ernest Rutherford developed an experiment that showed protons can pass through gold atoms untouched and/or un-deflected. Sometimes the protons were deflected by something, but this did not happen too often. Most of the atoms pass straight through. His experiment changed the way scientists viewed the structure of an atom. What conclusion did Rutherford draw from his experiment?

• The gold atoms are not close to each other
• The subatomic particles in the gold atoms are very close together
• Inside of the gold atom consists of empty spaces
• There can be no conclusion drawn from this observation

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The small numbers written below the symbol that tells you how many atoms there are

• coefficient

• atom

• subscript

• chemical formula

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The diagram above shows the repeating groups of atoms that make up two samples. Will the properties of the two samples likely be the same or different? (Examples of properties are smell, color, and the temperature at which a substance melts.)

• The properties will likely be different because there are more repeating groups of atoms in Sample 2.

• The properties will likely be different because the repeating groups of atoms that make up each sample are different.

• The properties will likely be the same because the repeating groups of atoms that make up the two samples have one of the same types of atoms.

• The properties will likely be the same because the repeating groups of atoms that make up the two samples have the same number of atoms.

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How many atoms are there all together in HCl?

• 1

• 2

• 3

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The Subscript (2) in the Chemical Formula, 3H₂O, tells you how many _____________ there are.

• Atoms of Hydrogen

• Atoms of Oxygen

• Atoms of Water

• Molecules of Water

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Use the picture at right to answer the question.  Given the Lewis Dot structure, which of the following elements could the unknown (X) represent?

 $X\cdot$  

• B

• C

• K

• Ca

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Molly makes a model of an atom, showing the protons, neutrons, and electrons. What field of science does she work in?

• Biology

• Geology

• Physics

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(8.5D 2019-Q17)

• A

• B

• C

• D

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