Final answer:
The correct order of elements by increasing number of protons is hydrogen, potassium, technetium, cerium, and rutherfordium.
Step-by-step explanation:
The question requires us to arrange the following elements in order of increasing number of protons: hydrogen, potassium, technetium, cerium, and rutherfordium.
- Hydrogen (H) - 1 proton
- Potassium (K) - 19 protons
- Technetium (Tc) - 43 protons
- Cerium (Ce) - 58 protons
- Rutherfordium (Rf) - 104 protons
Therefore, the correct order from fewest to most protons is: hydrogen, potassium, technetium, cerium, and rutherfordium.