What does the difference between 256 and 101 in 256/101 Md represent? the atomic number
the nuclide number
the mass number
the number of neutrons

Which is the layer underground where all empty spaces are filled with a combination of air and water ?

What is true for a substance that releases energy

At 20°c, a sample of h2o liquid and a sample of co2 gas each have the same average kinetic energy. why is one a liquid and the other a gas at this temperature?