Similar elements with similar properties were in the same groups and periods for instance lithium(Li) and sodium(Na) are alkaline metals and so belong to the same group (that is group 1).Also Hydrogen(H) and Helium(He) both have only one shell or energy level and so belong to the same period.
Well, if the substance started as a liquid, lost energy, and changed state, then it's in the SOLID state right now.
C. The Uniformity of Cosmic Background Radiation