Element z and x are compared. element z is larger than element x. based on this you could say:

Explanation :

On the basis of given information we concluded following points

Atomic number of Z more than atomic number of X.Atomic radius of Z more than atomic radius of X.Z could be an anion and X could be a cation.Effective nuclear charge of Z less than effective nuclear charge of X.

Okay well gravitational energy is matter forced by gravity making energy though the kinetic energy then the electric energy produces electricity from the kinetic energy and the kinetic energy gets its energy from the gravitational energy. was that the answer you wanted or something else?  

Firstly, the water in the dams hold gravitational potential energy as they are above ground level. the gravitational potential energy is then transferred to kinetic energy as it falls, spinning the turbinethe turbine then spins the generator, which is a large magnet surrounded by metal coils. by doing this, the generator generates electricity. in this action, the energy transfer taken place is kinetic to electric energy