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Weekly Web Work #6:

Ions and Ionic Compounds

This assignment was due by noon on Tuesday, February 18, 2003.

You are watching: Why do metals tend to form cations

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The purpose of this week"s assignment is to predict ion charges and also to start to create chemical formulas for ionic compounds.

The electron configurations of the noble gases are exceptionally stable. When an atom undergoes a chemical change to end up being an ion, the atom will certainly acquire or lose electrons till it is isodigital (has actually the very same electron configuration) through the nearest noble gas. Metals tfinish to shed electrons and create positively charged ions referred to as cations. Non-steels tend to gain electrons and create negatively charged ions referred to as anions.

For example, sodium metal, Na, 3s1, loses one electron to create the Na+ ion which is isoelectronic via neon. (All the alkali metals have one valence electron and develop 1+ cations.) Chlorine, 3s13p5, gains one electron to form Cl– ion which is isoelectronic through argon. (All of the halogens have 7 valence electrons and form 1- anions.)

Ionic compounds are written of steel cation(s) and also non-metal anion(s) and have actually a net charge of zero. Sodium chloride, NaCl, is created of Na+ and Cl– in a one to one ratio which provides the formula zero charge. When writing the formula for an ionic compound, the symbol for the cation is composed initially.

Note that developing ions from neutral atoms is a chemical reactivity. Click right here to view sodium steel and also chlorine gas reacting to develop sodium chloride. This video clip is from the McMurry textbook companion internet website (http://cwx.prenhall.com/bookbind/pubbooks/mcmurrygob/). If you can"t view the reaction, there is a photo of it on web page 74 in your message.

The complying with inquiries are designed to assist you start to think around ions and also ionic compounds. You might wish to look at chapter 4 area 7 (web page 79-81) and also area 10 (bottom of web page 84-87) in your textbook.

1.
Predict the formula of the compound developed as soon as lithium and fluorine react. (Remember, facets in the same group react similarly.)
2. Predict the formula of the compound developed when potassium and iodine react.
3. What ion will certainly magnesium form?
4. What ion will oxygen form?
5. What ion will certainly aluminum form?

When composing the formula for ionic compounds, the complete positive charge from the cations plus the total negative charge from the anions should include approximately zero for the formula to have a zero net charge. When writing formulas for an alkali metal reacting through a halogen, the ratio of ions is one to one. Remember our instance of NaCl above? NaCl is composed of Na+ and Cl– ions. So 1(1+) + 1(1-) = 0

What about the compound that creates once calcium reacts with bromine? Calcium creates the 2+ ion, Ca2+, because it needs to shed 2 electrons to be isoelectronic with argon. Bromine forms the 1- ion, Br–. The formula for calcium bromide is CaBr2. You require 2 bromide ions to balance the 2+ charge of the calcium ion so that the formula will certainly have no charge. 1(2+) + 2(1-) = 0

6. Predict the formula of the compound created once aluminum and chlorine react.
7. Explain the believed process you offered to figure out the formula for aluminum chloride in question 6.
8. Predict the formula for the compound formed when potassium and also oxygen react.
9.

See more: All Metals Expect _ Are All Metals Solid At Room Temperature ?

Exordinary the assumed process you provided to number out the formula for potassium oxide in question 8.

You have the right to modify your responses till you are satisfied with your answers. Remember, the purpose of the assignment is to help you think around a topic. Your answers don"t need to be "right" to get credit, you just must answer the concerns with your best effort.

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