The number in parentheses is not an atomic weight. It is the mass number of one radioactive isotope of the element.
Atomic weight from the Chemical Society of Japan, “Table of Standard Atomic Weights with Four Significant Figures (2026)”.
Mendeleev had called the element for gap number 43 “eka-manganese.”
In 1937, the Italian scientists Segrè and Perrier bombarded molybdenum with deuterons and made element 43, the first human “element synthesis.” Because it was made, it was named “artificial.”
In fact, in 1906, the Japanese chemist Ogawa Masataka had announced that he had found a new element number 43, which he called “nipponium.”
A little over a hundred years later, nihonium (element 113) became the first element with a name from Japan.
There is no single right answer. Talking it over with someone at home is a good way to learn.