What is the total number of atoms in the formula ca(clo3)2?

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.

Who discovered a pattern to the elements in 1869?

Wind and moving water provide energy. chemical mechanical thermal none of the above