An element, Y, has seven valence electrons. It bonds ionically, in a one-to-one ratio, with another element, X. State the possible identities of X and Y and their characteristic charges.

Which of the following describes qualitative data? a) recording the temperature of a solid as it is warmed. b) noting the color of a solution as it is heated. c) measuring the volume of an object by water displacement. d) taking the mass of an object using a balance.