Living by Chemistry
2nd Edition
ISBN: 9781464142314
Author: Angelica M. Stacy
Publisher: W. H. Freeman
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Question
Chapter U1.21, Problem 6E
Interpretation Introduction
Interpretation: Examples of three ionic compounds with metal to non-metal ratio of 1:2 are to be given and the total number of valence electrons in each compound has to be specified. Also, the compound names have to be given.
Concept Introduction: Ionic compounds are formed between metals and nonmetals. The metals and nonmetals in the periodic table can combine in a variety of ways to form a large number of ionic compounds. Valence electrons are electrons in the outermost orbit of an atom.
Expert Solution & Answer
Answer to Problem 6E
The following table shows ionic compounds formed with metals to nonmetals ratio of 1:2.
| Metal | Nonmetal | Compound | Number of valence electrons |
| Mg | Cl | MgCl2-sodium chloride | 16 |
| Ba | I | BaI2- barium iodide | 16 |
| Ca | Br | CaBr2- calcium bromide | 16 |
Explanation of Solution
Given information:
Metal to nonmetal ratio in ionic compounds is 1:2.
For a compound to have metal to nonmetal ratio of 1:2, the metal must have two valence electrons and the nonmetal must have seven valence electrons. For every metal atom, two nonmetal atoms are needed to fulfill a noble gas configuration. Sothe total number of valence electrons in the compound is 16. So the metal must be from group 2A and nonmetal must be from group 7A. Metals of group 1A or group 2 are beryllium, calcium, magnesium, strontium, barium and radium. Nonmetals of group 7 A are halogens like fluorine, chlorine, bromine, iodine and astatine. The charges on metals are +2 and nonmetals are -1 which together add up to zero.
To name the compound, the metal name comes first and then the nonmetal name is changed to “-ide”.
The ionic compounds possible are therefore magnesium chloride, magnesium bromide, magnesium iodide, magnesium fluoride, calcium chloride, calcium bromide, barium bromide, barium chloride, etc.
Conclusion
Metals and nonmetals combine to form ionic compounds. Such compounds are called salts.
Chapter U1 Solutions
Living by Chemistry
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U1 - Prob. C2.2RECh. U1 - Prob. C2.3RECh. U1 - Prob. C2.4RECh. U1 - Prob. C3.1RECh. U1 - Prob. C3.2RECh. U1 - Prob. C3.3RECh. U1 - Prob. C3.4RECh. U1 - Prob. C4.1RECh. U1 - Prob. C4.2RECh. U1 - Prob. C4.3RECh. U1 - Prob. C4.4RECh. U1 - Prob. C5.1RECh. U1 - Prob. C5.2RECh. U1 - Prob. C5.3RECh. U1 - Prob. C5.4RECh. U1 - Prob. 1RECh. U1 - Prob. 2RECh. U1 - Prob. 3RECh. U1 - Prob. 4RECh. U1 - Prob. 5RECh. U1 - Prob. 6RECh. U1 - Prob. 7RECh. U1 - Prob. 8RECh. U1 - Prob. 9RECh. U1 - Prob. 10RECh. U1 - Prob. 11RECh. U1 - Prob. 12RECh. U1 - Prob. 1STPCh. U1 - Prob. 2STPCh. U1 - Prob. 3STPCh. U1 - Prob. 4STPCh. U1 - Prob. 5STPCh. U1 - Prob. 6STPCh. U1 - Prob. 7STPCh. U1 - Prob. 8STPCh. U1 - Prob. 9STPCh. U1 - Prob. 10STPCh. U1 - Prob. 11STPCh. U1 - Prob. 12STPCh. U1 - Prob. 13STPCh. U1 - Prob. 14STPCh. U1 - Prob. 15STPCh. U1 - Prob. 16STPCh. U1 - Prob. 17STPCh. U1 - Prob. 18STPCh. U1 - Prob. 19STPCh. U1 - Prob. 20STPCh. U1 - Prob. 21STPCh. U1 - Prob. 22STP
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