If the researcher is looking for an element that reacts similarly to nitrogen (N) but has a greater atomic mass, the best choice would be Arsenic (As).
Here's a brief comparison of the elements listed:
- Na (Sodium): This is an alkali metal and does not have similar chemical properties to nitrogen.
- S (Sulfur): Although it is in a neighboring group in the periodic table, sulfur has different reactivity compared to nitrogen and has a lower atomic mass than arsenic.
- As (Arsenic): This element is in the same group (15) as nitrogen and can exhibit similar chemical behavior, especially in oxidation states like -3, +3, and +5. Arsenic has a greater atomic mass than nitrogen.
- Si (Silicon): This element is in group 14 and does not behave similarly to nitrogen.
Therefore, the researcher should select Arsenic (As).
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