3 (a) Two isotopes of uranium are U-235 and U-238 - Edexcel - GCSE Physics - Question 3 - 2012 - Paper 1
Question 3
3 (a) Two isotopes of uranium are U-235 and U-238.
Here are the symbols of the nuclei of these isotopes.
(i) Complete the sentence by putting a cross (✗) in the... show full transcript
Worked Solution & Example Answer:3 (a) Two isotopes of uranium are U-235 and U-238 - Edexcel - GCSE Physics - Question 3 - 2012 - Paper 1
Step 1
Complete the sentence by putting a cross (✗) in the box next to your answer.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The U-235 isotope has C more neutrons than U-238. This is because U-235 has a mass number of 235 and U-238 has a mass number of 238, which indicates that U-238 has 3 more neutrons than U-235.
Step 2
Describe an alpha particle.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
An alpha particle is a type of subatomic particle that consists of two protons and two neutrons. It is essentially a helium nucleus. Alpha particles are positively charged and are emitted during the radioactive decay of certain isotopes, such as U-235. Due to their mass and charge, they have low penetration power and can be stopped by a sheet of paper or human skin.
