Lesson 121: Progress Check

Each row on the periodic table is called a ________.

Sort the following based on atomic radius (from smallest to largest).

• Gallium < Niobium < Oxygen < Francium < Cobalt

• Francium < Niobium < Cobalt < Gallium < Oxygen

• Oxygen < Gallium < Cobalt < Niobium < Francium

• Oxygen < Niobium < Cobalt < Gallium < Francium

Which correctly sorts elements based on the number of valence electrons (from fewest to greatest)?

• Radon < Chlorine < Oxygen < Phosphorus < Carbon < Aluminum < Beryllium < Potassium

• Potassium < Beryllium < Aluminum < Carbon < Phosphorus < Oxygen < Chlorine < Radon

• Chlorine < Radon< Oxygen < Beryllium < Carbon < Aluminum < Phosphorus < Potassium

• Radon < Beryllium < Chlorine < Carbon < Phosphorus < Oxygen < Potassium < Aluminum

What is the electron configuration for Chlorine?

• 1s2 2s2 2p6 3s2 3p4

• 1s2 2s2 2p6 3p7

• 1s2 2s2 2p6 3s2 3p6

• 1s2 2s2 2p6 3s2 3p5

Which is the correct lewis dot diagram for Sulfur?

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Electrons flow from zinc to copper in a voltaic pile battery because

• Zinc is more electronegative than copper.

• Copper is more electronegative than zinc.

• Copper is an electrolyte

• Zinc repels electrons.

What is the correct lewis dot diagram for C2H2?

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What is the largest ion? (Hint: They all have the same electron configuration.)

• F–

• O2–

• Na+

• Mg2+

Which scientist was instrumental in creating the periodic table and was able to predict the existence of unknown elements (and even some of their properties)?

• Albert Einstein

• Dmitry Mendeleev

• Isaac Newton

• Charles Darwin

• Galileo Galilei

An electrolyte is a

• A compound that dissociates into ions

• A phosphorescent material

• A magnetic compound

• A compound that contains only cations.

• A compound that contains only anions.