Electrons spin in shells around the nucleus. what is the maximum number of electrons that the closest shell (n = 1) can contain?

The maximum number of electrons that can be present in an closest shell is

= 2

In First shell only 2 electron can be placed

a boiling water reactor does not boil the water. a pressurized water reactor boils the water faster. a pressurized water reactor is heated directly by the core. a pressurized water reactor does not use fission.