Answer:
18.6 g/cm^3
Explanation:
17.4g/0.934g/cm^3
(divide)
im pretty sure you need 15 in all but dont get mad it thats wrong, so you would i think need 3 neutrons
The answer is 3. As 5 * 3 = 15.
Is there any other equations I may be able to help you with? :)