What must be satisfied for a hypothesis to be useful

The following are the desirable features of a hypothesis that makes them useful:  

1. A hypothesis should be susceptible to observation, and it should not be normative.  

2. A good hypothesis should exhibit a generality.  

3. A hypothesis should be specific, that is, the concepts are defined in a careful manner.  

4. A good hypothesis should not defy logic.  

5. And ultimately, a good hypothesis needs to be testable.  

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explanation:

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.