When Mendeleyev changed the layout, there were gaps where no known element fit.
How did the gaps help scientists look for
undiscovered elements? Those are the answers in the picture:)

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

The answer is bhope this

Ametal with a large number of free flowing electrons most likely has good conductivity

Here is the link to the all information u need i mean answer key