Why was the theory of the atom so controversial back in the early 1900's?

Answer : The theory of atom was controversial in early 1900's because people still thought that things can continue to be further divided and sub-divided.

This was the opinions of the people during early 1900's which created controversies from the theory proposed. Back in minds of people it was hard for them to believe that atoms were the smallest part present in any matter. When it was proved with several other supporting theories in late 1900's people started to believe the theory of atoms.

answer; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.