The thing about nuclear fission is that the daughter products vary. By absorbing a neutron, U-235 becomes unstable and splits. This splitting process does not always result in the same daughter products every time, although there is some statistical information available on the *most likely* fission fragments, e.g.

At Higher level, you need to be able to analyse whatever data is given in the question. Normally, this will involve a calculation of the energy released as a result of the fission processs.

To calculate the energy released, you follow a similar method to momentum questions, i.e. find the total mass BEFORE fission and the total mass AFTER fission.

The difference in mass (mass Before – mass AFTER) is the value of m to be used in Einstein’s equation E=mcc (c squared) to determine the energy released.

why do you think the fission of 235 into 92 and 142 not two even atoms,and who wrote about this

The thing about nuclear fission is that the daughter products vary. By absorbing a neutron, U-235 becomes unstable and splits. This splitting process does not always result in the same daughter products every time, although there is some statistical information available on the *most likely* fission fragments, e.g.

http://en.wikipedia.org/wiki/Fission_product_yield

At Higher level, you need to be able to analyse whatever data is given in the question. Normally, this will involve a calculation of the energy released as a result of the fission processs.

To calculate the energy released, you follow a similar method to momentum questions, i.e. find the total mass BEFORE fission and the total mass AFTER fission.

The difference in mass (mass Before – mass AFTER) is the value of m to be used in Einstein’s equation E=mcc (c squared) to determine the energy released.