Answer:
The rate reduces by a factor cf /2.
They have the same density because a material, no matter how much of it there is, will always be a certain density. A 40g ball of iron has the same density as a 1g ball of iron.
You would be able to tell if you could see it on the period table ig.
A) Z + 4
In the actual atom, half of the nucleus would be protons and the other half neutrons, hence the 2z. The additional four in the expression must be neutrons because adding protons would change the element all together.
