In the symbol 42he, the subscript 2 is the for helium and the superscript 4 is the for helium.

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.

In 2002, the rare earth elements mine in mountain pass, california was closed because

Geothermal energy for industrial use is available almost anywhere. a. true b. false