<span>Theory is an unproven best guess at answering a question. Over time, people tweak the theory until it fits every possible situation it can be a part of, through publishing scientific findings and eventually coming to a complete conclusion that becomes scientific law. </span>
Answer:Theories may be changed over time as new information is discovered or new technologies are developed. New developments lead to changes in experimental methods, which provide information that may or may not support the existing theory. If the theory is still supported, it may be updated. If it is not supported, but the results are true and relevant, the theory may be replaced.
Explanation: When a chlorine atom gains an electron, its outermost principal energy level achieves an octet. In this case, the ion has the same outermost shell as the original atom, but now that shell has eight electrons in it.
