Magnesium has an atomic number of 12. Calculate the number of electrons found in one Mg^2+ ion.​

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?

Which substance is a steroid? cholesterol fatty acid monosaccharide trans fat

What is true for a substance that releases energy