Group 6A elements

Tellurium, a group 6A element, forms the oxoanions Te042- and Te032. What are the likely names of these ions To what other group 6A oxoanions are they analogous ... 

The unusually low Ej values for atoms of group 6A elements can also be explained by their electron configurations. In comparing nitrogen with oxygen, for example, the nitrogen electron is removed from a half-filled orbital, whereas the oxygen electron is removed from a filled orbital ... 

PROBLEM 6.25 Although we haven t talked about group 6A elements in this chapter, what are they likely to do in redox reactions—gain or lose electrons How many ... 

Group 6A elements, such as oxygen, have six valence electrons and form two bonds, as in water, H20. The oxygen atom in the resultant molecule has two bonding pairs of electrons and two lone pairs. 

The group 6A elements are oxygen, sulfur, selenium, tellurium, and polonium. As shown in Table 19.7, their properties exhibit the usual periodic trends. Both oxygen and sulfur are typical nonmetals. Selenium and tellurium are primarily non-metallic in character, though the most stable allotrope of selenium, gray selenium, is a lustrous semiconducting solid. Tellurium is also a semiconductor and is usually classified as a semimetal. Polonium, a radioactive element that occurs in trace amounts in uranium ores, is a silvery white metal. 

Dry photocopiers use an unusual property of selenium, the group 6A element below sulfur in the periodic table. Selenium is a photoconductor, a substance that is a poor electrical conductor when dark but whose conductivity increases (by a factor of 1000) when exposed to light. When the light is removed, the conductivity again drops. 

Identify the group 6A element that best fits each of the following descriptions ... 

Find a flowering plant that interests you. Look at the root formation, leaf shapes and how they are attached to the stem, and the shape of the flower. Draw these different shapes. Find molecules that resemble these different shapes. Remember that group 3A elements form trigonal planar shaped molecules, group 4A elements form tetrahedral shaped molecules, group 5A elements form pyramid shaped molecules and group 6A elements form bent shaped molecules. Carbon chains have a zigzag shape and the DNA molecule is a double helix. You will see that these molecular shapes are duplicated in natural objects. See how many molecular shapes you can find in an ordinary flower. 

When aluminum metal is heated with an element from Group 6A of the periodic table, an ionic compound forms. When the experiment is performed with an unknown Group 6A element, the product is 18.56% A1 by mass. What is the formula of the compound ... 

TABLE 19.4 Selected Physical Properties, Sources, and Methods of Preparation for the Group 6A Elements... 

Symbol of the Group 6A element that, like selenium, is a semiconductor. 

Identify each of the following elements (a) a halogen whose anion contains 36 electrons, (b) a radioactive noble gas with 86 protons, (c) a Group 6A element whose anion contains 36 electrons, (d) An alkali metal cation that contains 36 electrons, (e) a Group 4A cation that contains 80 electrons. 

FIGURE 8.19 The Group 6A elements sulfur, selenium, and tellurium. Molecular axygen is a colorless, odorless gas. Polonium (not shown) is radioactive. 

Step 2 Both O and S are Group 6A elements and so have six valence electrons each. Including the two negative charges, we must therefore account for a total of 6 + (4 X 6) + 2, or 32, valence electrons in SO4. ... 

Except for O, the Group 6A elements form a wide range of halides whose stability depends on crowding between lone pairs and surrounding halogen (X) atoms. Therefore, with increasing size of E and X, E—X bond length increases, electron repulsions between lone pairs and X atoms weaken. 

Phosphorus in Fertilizers 20.10 The Group 6A Elements The Chemistry of Oxygen The Chemistry of Sulfur Sulfur Oxides Oxyacids of Sulfur... 

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