rules: 1. change the version by .1 and update the changelog every version. 2. no adding fake elements, and the real element must match the atomic weight. 3. consult the periodic table if you add more elements. 4. you can add items and elements. for items, it must be related to atoms and elements. for elements, you can't add fake elements. 5. you can not add or remove rules. changelog: v.0: added 3 elements and atoms. it's on work in progress.
