Answer: uranium
Explanation: It’s hard to find when mining and is required for nuclear fission
Answer:
NaOH(aq) is a Base.
Explanation:
Those substances which give or release
ions in aqueous solution are called as the Arrhenius Bases.
In the aqueous solution, NaOH dissociates as follows -
↔ 
If it reacts with a strong acid HCl, the chemical equation for this reaction will be as follows -

Answer is: 4)Mass
I really hope this helped you out!!!!
Hello! The correct answer is, B. are in motion outside the nucleus.
I hope this helped!