An atom contains a total of 25 electrons. when the atom is in the ground state, how many different principal energy levels will contain electrons

If a molecule with a molecular formula of c13h18 is treated with an excess of h2 in the presence of finally divided pt metal under conditions required for maximum hydrogenation of the molecule to give a molecule with a formula c13h24, how many rings are in the molecule?

In what environment would mineral formation caused by high pressures and high temperatures most likely occur?

One nanometer is equal to how many meters?