What is wrong with this experiment? "when it was heated, the sample of carbon decomposed? "?

Complete each row of the table below by filling in the missing prefix or missing exponent.

The characteristics 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 an element. which statement is true about the atoms of the elements that participate in the two reactions? their identity changes in both reaction a and reaction b. their identity changes in reaction a but not in reaction b. their identity changes in reaction b but not in reaction a. their identity remains the same in both reaction a and reaction b.

How can the periodic table be used to predict the behavior of elements?