Which description best describes the group and period trends in atomic radii in the periodic table? A. generally increases going across periods and generally increases going down groups
B. generally increases going across periods and generally decreases going down groups
C. generally decreases going across the periods and generally increases going down groups
D. generally decreases going across periods and generally decreases going down groups

Use the periodic table to determine the electron configuration of dysprosium (dy) and americium (am) in noble-gas notation.

Choose all the answers that apply. ionic compounds dissolve easily in water do not dissolve in water have low melting points have high melting points conduct electricity when melted

Sulfur dioxide and oxygen react to form sulfur trioxide during one of the key steps in sulfuric acid synthesis. an industrial chemist studying this reaction fills a 25.0l tank with 4.5 mol of sulfur dioxide gas and 4.5 mol of oxygen gas at 30.°c. he then raises the temperature, and when the mixture has come to equilibrium measures the amount of sulfur trioxide gas to be 1.4 mol. calculate the concentration equilibrium constant for the reaction of sulfur dioxide and oxygen at the final temperature of the mixture. round your answer to 2 significant digits.