Acube sliding across the table slows down and stops. why does it stop?

Need ! asap will mark 10 pts using the room temperature line (orange line) and your periodic table, make lists that identify the state of matter (gas, liquid, or solid) in which each element you plotted exists at room temperature. explain your answers

As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit

What type of radiation is lead emitting in the following equation? alpha particles beta particles gamma rays