How much heat (J) is required to heat a 75.00 g copper block from 35.0°F to 59.0°F?

Which of these conditions most likely produces an unstable isotope?

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.

Which of the following is not true about the atomic model of substances?