Which of the following pairs is an example of the diagonal rule? h, he fe, rh i, po li, mg

Which statement describes james chadwick’s discovery.

Which fact represents evidence for the big bang theory?

Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.