Which elements are included in group 5a? se, te, po rb, xe sn, pb n, p, bi

What neutral atom is isoelectronic to mn+4

Which rate indicates the number of children that would be born per woman if she were to live to the end of her child bearing years

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)