the ionic radii of the ions s2–, cl–, and k are 184, 181, 138 pm respectively. explain why these ions have different sizes even though they contain the same number of electrons.

Which type of reaction is shown in this energy diagram? energy products activation energy reactants time o a. endothermic, because energy is released to the surroundings o b. exothermic, because energy is absorbed from the surroundings o c. exothermic, because energy is released to the surroundings o d. endothermic, because energy is absorbed from the surroundings

You can estimate the degree to which a bond between two atoms is ionic or covalent by calculating the

Which statement describes the formation of our sun? a disk formed of long trails of stars coiled into a spiral. it formed an elliptical flattened disk. heat and gases contracted within a nebula. gravity pushed stars away from a center core.