When considering atomic orbitals the only important information they really wanted to know is the size of the orbit, which was described by using quantum numbers.
I would pick the first option in the third option
Answer:
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.
Explanation:
