The lanthanide elements react with oxygen to give compounds of the type Ln2O3 (where Ln stands for a lanthanide element). However, there are interesting exceptions, such as a common oxide of terbium, TbxOy. a) Given that the compound is 73.945% Tb, what is its formula? b) What is the oxidation number of terbium in this compound? c) Write a balanced equation for the reaction of terbium and oxygen to give this oxide. Also indicate the physical states of all the reagents and product/s. Al stoichiometric coefficients must be whole numbers.

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Q: How many types of boranes does boron forms?

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Q: Describe the basic properties of Chlorite.

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Q: Give some examples of Metallic hydrides?

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Q: Cite and explain three reasons why ferrous alloys are used so extensively.

A: Three reasons why ferrous alloys are used so extensively have to be explained below.

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Q: What are the possible reactions for the reaction of Aluminum with HCL and Water ? And what is the…

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Q: A blast furnace uses Fe₂O₃ to produce 8400. t of Fe per day.(a) What mass of CO₂ is produced each…

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Q: Write the balanced reaction for the synthesis of Al2O3 from its elements?

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Q: Elemental boron is produced by reduction of boron oxide with magnesium to give boron and magnesium…

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Q: The lanthanide elements reacts with oxygen to give compounds of the type Ln2O3.However,the are…

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Q: Chlorine reacts with oxygen to form Cl2O7. (a) What is thename of this product (see Table 2.6)? (b)…

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Q: What is the oxidation number of S in the compound Na,S,O5?

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Q: What is the VSEPR geometrical shape of the silicate ion, SiO32- ?

A:

Q: What is the oxidation state of nitrogen in NO2?

A:

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Q: You started your preparation of common alum with 1.4971 g of aluminum foil. What is the theoretical…

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Q: What safety precautions should be taken with selenium? I am preparing to remove selium from water…

A: Selenium is an essential metal for human and other animals, but taking higher doses can be harmful.

Q: Why KMNO, is stored in amber colored bottles?

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Q: Which of the following is NOT a possible oxidation state of Mn? O +8 O +3 O +7 O +5 O +2

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Q: What is the oxidation state of tungsten in WO3?

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Q: What is white phosphorus?

A:

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Q: Why is boron limited to a maximum coordination number of four in its compounds?

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Q: Why is Li best reducing agent where as Fluorine is best oxidizing agent ?

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Q: Does roasting increase or decrease the mass of sulfides?

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Q: Why are the lanthanoid elements not found in nature in their elemental forms?

A:

Q: 9. Assume that you have these materials: a) Li (s); b) Br2 (1); Ge (s) and d) Si(s). Choose the best…

A: Metals are good conductors because of presence  of free electrons.

Q: 3. Why might arsenic be able to substitute for phosphorus?

A: Arsenic is able to substitute phosphorus because both have  similar  chemical properties.

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Q: What is the most simple silicate material, chemically?

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Q: What is the common ore of tin and how is tin separated from it?

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Q: Explain Halogenation ?

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Q: Out of white phosphorus and red phosphorus, which one is more reactive and why?

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Group 13 Elements

In the periodic table, group 13 elements exist in the first p-block. There are six elements present in group 13, which include boron (B), aluminum (Al), gallium (Ga), indium (In), thallium (Tl), and element 113 (ununtrium, (Uut)). Group 13 elements are also designated as the boron family.