Short Answer 
To find combinations of chemical elements with atomic numbers summing to 200, first understand each element’s atomic number, then calculate possible combinations. Finally, validate these combinations to ensure they correctly add up to 200, while adhering to the principle of conservation in nuclear reactions.
Step 1: Understand Atomic Numbers
Each chemical element has a unique identifier known as its atomic number, which indicates the number of protons in its nucleus. To find combinations of elements with atomic numbers summing to 200, it’s essential to know these values. For example:
- Mercury (Hg) – Atomic Number: 80
- Silver (Ag) – Atomic Number: 47
- Copper (Cu) – Atomic Number: 29
- Tungsten (W) – Atomic Number: 74
Step 2: Calculate Possible Combinations
Begin to calculate combinations that equal a total of 200 by adding the atomic numbers of selected elements together. For instance, you can start with:
- 80 (Hg) + 47 (Ag) = 127
- Then add 29 (Cu) to reach 156
- Finally, adding 44 (W) will give you a final sum of 200.
Step 3: Validate Your Combinations
After identifying potential combinations, ensure that their total indeed equals 200. It’s also crucial to remember the principle of conservation when considering atomic numbers, which means they should balance in nuclear reactions. The combinations should be verified with no overlaps or miscalculations:
- For the chosen elements: Hg + Ag + Cu + W = 200
- Recheck each atomic number used to confirm accuracy.