What type of atom is hydrogen with an atomic mass of 1 and 2 electrons

Which statement describes how phase changes can be diagrammed as a substance is heated? the phase is on the y-axis and the temperature is on the x-axis. the temperature is on the y-axis and the phase is on the x-axis. the time is on the y-axis and the temperature is on the x-axis. the temperature is on the y-axis and the time is on the x-axis.

Fill in the coefficients that will balance the following reaction: a0cr2(so4)3 + a1agno3

What are the 4 phases of matter in order of increasing engery content?