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Home  arrow Chapter 6: Ionic Bonds and Some Main-Group Chemistry  arrow Problem Solving Center  arrow Understanding Key Concepts

Understanding Key Concepts



This activity contains 10 questions.

Question 1.

Francium is a rare and relatively unexplored element. What would you predict its physical state to be at room temperature?


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Question 2.

Is francium likely to react with iodine? If so, what is the formula of the product?


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Question 3.

What is the most likely identity of "X" in the reaction
4 Ga + 3 X2 ---> 2 Ga2X3?


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Question 4.

Which element has the highest first-ionization energy?


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Question 5.

Which element has the lowest second-ionization energy?


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Question 6.

Which metal has the most negative electron affinity?


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Question 7.

Which metal would be least safe to drop into water?


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Question 8.

Which redox reaction is unlikely to occur?


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Question 9.

Consult Table 6.4 to predict an approximate density for francium.

TABLE 6.4     Properties of Alkali Metals
Name Melting Point (°C) Boiling Point (°C) Density (g/cm3) 1st Ionization Energy (kJ/mol) Abundance on Earth (%) Atomic Radius (pm) Ionic (M+) Radius (pm)
Lithium 181 1342 0.53 520.2 0.0020 152 68
Sodium 98 883 0.97 495.8 2.36 186 102
Potassium 63 760 0.86 418.8 2.09 227 138
Rubidium 39 686 1.53 403.0 0.009 0 248 147
Cesium 28 669 1.87 375.7 0.000 10 265 167
Francium ˜400 Trace


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Question 10.
Which is not a property of an alkali metal?


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