Question

Which of the following is true about Uranium-238?

1. Its chemical properties will be similar to uranium-235
2. It's mass is different from that of an atom of uranium-235
3. It will contain a different number of protons than U-235
D. It is more plentiful in nature than uranium-235

Answer 1

Well isotopes, remember they are the same element essentially because their number of protons are the same. The only thing that is different is their number of Neutrons.

Answer 2

Well, usually the heavier you get on the periodic table it's going to be less stable I.E. a tendency to decay. If I remember correctly, this includes everything greater than lead Pb

Answer 3

So the answer is 2 because the neutrons are different, so the mass will be different?

Answer 4

right.
Also, the abundance of each on Earth is different, Something like 99.5% of all the Uranium here in nature is U-238 , U235 is less then 1% abundance.