Ba, Cu, Ne lowest to highest ionization energy

What is the number of atoms in 3.54 mol s

Stage in which a typical star has completely stopped fusion

The twister and runaway train are two coasters at the same amusement park. both coasters start at the same height. the coaster for the twister is twice the mass of the coaster for the runaway train. which roller coaster has greater gravitational potential energy at the start of the ride?