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Ch.7 - Periodic Properties of the Elements
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All textbooksBrown 14th EditionCh.7 - Periodic Properties of the ElementsProblem 74c

Chapter 7, Problem 74c

Little is known about the properties of astatine, At, because of its rarity and high radioactivity. Nevertheless, it is possible for us to make many predictions about its properties. (c) What is the chemical formula of the compound it forms with Na?

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Hey everyone R. Question here tells us that calorie um is in our group six A. And they want us to predict the chemical formula of the compounded forms with potassium. Looking at our periodic table, we know that potassium is in our group one A. So it has a charge of plus one, combining this with Hillary um which is in our group six A. This means Tillery um has a charge of -2. And when these two combined we can simply use our criss cross method And our formula is going to be K. two T. E. Which is potassium telluride. So I hope this made sense and let us know if you have any questions.
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Textbook Question

Potassium and hydrogen react to form the ionic compound potassium hydride. (b) Use data in Figures 7.10 and 7.12 to determine the energy change in kJ/mol for the following two reactions: K1g2 + H1g2 ¡ K+1g2 + H-1g2 K1g2 + H1g2 ¡ K-1g2 + H+1g2

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Textbook Question

Little is known about the properties of astatine, At, because of its rarity and high radioactivity. Nevertheless, it is possible for us to make many predictions about its properties. (a) Do you expect the element to be a gas, liquid, or solid at room temperature?

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Textbook Question

Little is known about the properties of astatine, At, because of its rarity and high radioactivity. Nevertheless, it is possible for us to make many predictions about its properties. (b) Would you expect At to be a metal, nonmetal, or metalloid? Explain.

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Write a balanced equation for the reaction that occurs in each of the following cases: (c) Sulfur reacts with hydrogen gas.

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Write a balanced equation for the reaction that occurs in each of the following cases: (d) Fluorine reacts with water.

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Consider the stable elements through lead (Z = 82). In how many instances are the atomic weights of the elements out of order relative to the atomic numbers of the elements?

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