What evidence indicates that the nuclei of strontium-90 atoms are unstable?
a) strontium-90 electrons are in the excited state.
b) strontium-90 electrons are in the ground state.
c) strontium-90 atoms spontaneously absorb beta particles.
d) strontium-90 atoms spontaneously emit beta particles.

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.

How much would the freezing point of water decrease if 4 mol of sugar were added to 1 kg of water(k=1.86 c/mol/kg for water and i=1 for sugar

If two atoms are bonded to a central atom with no lone pairs, how will they be arranged