Many elements in the third row and beyond in the periodic table may form more than four bonds and thus appear to have “expanded octets." Phosphorus and sulfur, for example, may form five and six covalent bonds, respectively Count up the total number of valence electrons in PCl5, and draw its Lewis structure. How many valence electrons are "counted” toward the central P atom?

The first element on the periodic table of elements is carbon. a. true b. false

During trial 2, what allowed you to determine that aluminum was the limiting reactant? check all that apply. all of the copper dissolved. all of the aluminum dissolved. the solution turned clear. the number of grams of copper(ii) chloride used in the reaction was greater than the number of grams of aluminum. the molar ratio of copper(ii) chloride to aluminum was greater than 3: 2, the equation’s molar ratio.

8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.