Get Addison Wesley Chemistry 11 PDF

By Geoff Rayner-Canham et el.

ISBN-10: 0201708124

ISBN-13: 9780201708127

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By Geoff Rayner-Canham et el.

ISBN-10: 0201708124

ISBN-13: 9780201708127

Show description

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The nitrogen atom has 5 outer electrons and will share 3 of them with the electrons from the 3 hydrogen atoms to attain a noble gas configuration. Solution Therefore, the nitrogen and each of the 3 hydrogen atoms will share a pair of electrons. The nitrogen will also have 1 pair of unshared electrons. 16 H In the process, 3 covalent bonds are formed between hydrogen and nitrogen. Draw the Lewis structure for SCl2. EXAMPLE 2 Predict the formula of the compound formed by oxygen and fluorine. 18 The oxygen atom needs 2 electrons to acquire a noble gas configuration, and the fluorine atom needs 1.

For a long time, chemists thought that the noble gases did not react and form compounds. They attributed this characteristic to the fact that all noble gases, except for helium, have 8 outer electrons, an octet, and claimed that this configuration made them too stable to react. This theory dominated scientists’ thinking for a long time. Many atoms react with each other in a way that leaves them with 8 electrons in their outer shells. One such reaction involves transferring electrons from a metallic atom to a non-metallic atom to form ions and ionic compounds.

23. The graph below represents the number of elements discovered during different periods throughout history. Using this information, complete the following: a) Identify the characteristic common to the elements discovered before 1750. b) Determine during which period the most elements were discovered. c) Explain how Mendeléev’s work contributed to the discovery of many elements. Number of elements 25 24 25 20 20 15 15 14 14 1901– 1950 1951– present 10 5 Quit 24. The element with atomic number 119 has not yet been isolated.

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Addison Wesley Chemistry 11 by Geoff Rayner-Canham et el.


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