The mass number of a nucleus (except hydrogen) is:

always less than its atomic number
never less than its atomic number
sometimes equal to its atomic number
sometimes less than and sometimes more than its atomic number

43.452

step-by-step explanation:

284 times .153 = 43.452

you did not give any options thus this is the best answer i can give to you with this little information you have given

> they are both natural and not man made

> they can be tracked and predicted by the right tools

-love shrooms