Unit 2 Check

Elements on the periodic table are arranged by

• increasing atomic mass

• increasing density

• increasing atomic number

• increasing chemical reactivity

• energy levels
• valence electrons
• protons
• neutrons

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• Metals
• Nonmetals
• Metalloids

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The horizontal row on the periodic table is called a

• group
• family
• period
• atomic number

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Which of the following is the most metallic element in period 3?

• Boron (B)
• Sodium (Na)
• Argon (Ar)
• Silicon (Si)

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Which symbol represents an alkaline earth element?

• Na

• Mg

• Ne

• Ag

What element is represented in this Bohr Model?

• Carbon

• Hydrogen

• Aluminum

• Lithium

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How many valence electrons?

• 2
• 3
• 5
• 10

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What is the atomic number of this atom?

• 2

• 4

• 6

• 8

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How did Rutherford discover the proton?

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

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