Final answer:
Chemical elements with atomic numbers that sum up to 200 can be found by choosing suitable combinations, such as Mercury (80), Silver (47), Copper (29), and Tungsten (44), which total exactly 200 when added together.
Step-by-step explanation:
The student is asking for combinations of atomic numbers that add up to 200. In chemistry, the atomic number represents the number of protons in the nucleus of an atom and each element has a unique atomic number.
When looking for elements whose atomic numbers sum up to 200, you could choose combinations such as Hg (Mercury, atomic number 80) and Ag (Silver, atomic number 47) and Cu (Copper, atomic number 29), because 80 + 47 + 29 = 156, and then add another element such as W (Tungsten, atomic number 74) to reach exactly 200 (156 + 44 = 200).
The principles of conservation of atomic numbers as seen in nuclear reactions, where the sum of atomic numbers must remain constant, guide this kind of inquiry.