physics

The following is a summary of a nuclear fission reaction: 235 1 →unknown nucleus A (Equation 1) 92 U On

unknown nucleus A → 90 Sr + unknown nucleus B + 3 1n (Equation 2) 38 O

Can you help find the mass number and atomic number for the unknown nuclei A and B to identify them. can you explain this to me and how you got worked this out, thank you most sicnerely.

I have done some workings but think it may be incorrect

Answers
Not sure which bit you are confused about, but mass number is number of neutrons + number of electrons of a nuclei and it has to be maintained . I'm trying to make sense of your equation here. Maybe you could type in your workings and we can have a look at them ..
shaunattutorhub
27 April 2011
You probably know this, but the mass number has to be maintained across the reaction, so that's how we calculate the new mass number
shaunattutorhub
27 April 2011
the equation has changed when submitted for some reason, sorry, it is:
student1988
27 April 2011
235 92 U + 1 0 n
student1988
27 April 2011
and i got this
student1988
27 April 2011
unknown nucleus A
student1988
27 April 2011
sorry when i type in equations this page moves them around
student1988
27 April 2011
235 U + 1 n
student1988
27 April 2011
92 O 56 a 36 O (underneath line)
student1988
27 April 2011
Hi. This is Tutorhub Admin. It seems that you are having problems posting symbols, please can you email me at jon@tutorhub.com and I will try to help.
tutorhubadmin
27 April 2011
You could use the pink feedback and support button too, to get in contact with us.
tutorhubadmin
27 April 2011
The thing to remember is that the atomic number (the lower number) and atomic mass (the top number) of all the atoms and particles before the reaction should equal all of the atomic numbers and atomic masses of the atoms and particles after the reaction. you can add these numbers up for one side of the reaction and, based on the information given, calculate the atomic mass and atomic number of unknown nucleus A and unknown nucleus B. Once you know the atomic mass and the atomic number, you can look up the element. In strict terms, this is an approximation, because energy is released, giving rise to a phenomenon known as 'mass defect'.
parkfields
27 April 2011
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