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CHE 105/110 Introduction to Chemistry - Exercises and Answers

Electron Transfer: Ionic Bonds

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QUESTION ANSWER

1.

Comment on the possible formation of the K2+ ion. Why is its formation unlikely?

1.

The K2+ ion is unlikely to form because the K+ ion already satisfies the octet rule and is rather stable.

3.

How many electrons does a Ba atom have to lose to have a complete octet in its valence shell?

3.

two

5.

How many electrons does an Se atom have to gain to have a complete octet in its valence shell?

5.

two

7.

With arrows, illustrate the transfer of electrons to form potassium chloride from K atoms and Cl atoms.

7.

Diagram showing the ionic bond between Potassium ion (K+) and Chloride ion (Cl-) is an electrostatic force holding both atoms together after Potassium ion (K+) transferred one electron to Chloride ion (Cl-). The Potassium Chloride (KCl) compound is electrostatically neutral.

9.

With arrows, illustrate the transfer of electrons to form scandium fluoride from Sc atoms and F atoms.

9.

Diagram showing the ionic bond between Scandium (Sc3+) and three Fluoride ions (F-)  is an electrostatic force holding atoms together after Scandium (Sc3+) transferred three electrons to Fluoride ions (F-).  The Scandium Chloride (ScF)  compound is electrostatically neutral.

11.

Which ionic compound has the higher lattice energy—KI or MgO? Why?

11.

MgO because the ions have a higher magnitude charge

13.

Which ionic compound has the higher lattice energy—BaS or MgO? Why?

13.

MgO because the ions are smaller

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