What is the electron structure of a beryllium ion with a net ionic charge of +2? 1s 2
2s 2
1s 1
2s 1

In order for a high temperature boiler or steam engine to produce superheated water, or steam: the heat source must be greater than 100°c the water must be permitted to evaporate quickly the system must be sealed and become pressurized above atmospheric pressure the vapor pressure must be kept below 760 mm(hg)