Answer
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Step 1: Begin by listing all elements that start with the letter "D".
- Dysprosium (lanthanide metal, $$_{66}\text{Dy}$$)
The elements that start with the letter "D" are:
Step 2: Now, list all elements that start with the letter "X".
- Xenon (noble gas, $$_{54}\text{Xe}$$)
The elements that start with the letter "X" are:
Final Answer
The elements that start with the letter "D" are Diamond (carbon allotrope), Deuterium, and Dysprosium. The element that starts with the letter "X" is Xenon.
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