Heavy Element Formation Learning Goal: Understand the mechanism through which he

Question

Heavy Element Formation

Learning Goal:

Understand the mechanism through which heavy elements are formed, and balance the equation associated with their formation.

A Supernova forms when the gravity of the star is so great that the core of the star can no longer resist the force of gravity and collapses in on itself. As the matter in the star compresses it reaches an unstable state and explodes, blowing most of its matter into space. During the explosion, a great number of neutrons present allow for multiple neutron capture events to take place. This leads to the formation of heavy elements (Z > 58). An example of this type of reaction is the formation of 7935Br from an 5626Fe nucleus:

5626Fe+2310n?[7926Fe]?7935Br+9 0?1?

The neutrons generated in the explosion are taken up by the 5626Fe nucleus to give an unstable intermediate which undergoes radioactive decay to give the more stable 7935Br.

Part A

How many neutrons must an 5626Fe nucleus capture to generate the unstable intermediate [7326Fe] according to the equation:

5626Fe+ ? 10n?[7326Fe]

Express your answer numerically as an integer.

Part B

Heavy Element Formation Part A Learning Goal 26 Understand the mechanism through which heavy elements are formed, and balance the equation associated with their formation n A Supernova forms when the gravity of the star is so great that the core of the star can no longer resist the force of gravity and collapses in on itself. As the matter in the star compresses it reaches an unstable state and explodes, blowing most of its matter into space. During the explosion, a great number of neutrons present allow for multiple neutron capture events to take place. This leads to the formation of heavy elements (Z > 58). An example of this type of reaction is the formation oBr from an 56 Fe nucleus Express your answer numerically as an integer Submit Hints My Answers Give Up Review Part 35 Incorrect; Try Again; 5 attempts remaining Part B The neutrons generated in the explosion are taken up by the 5 Fe nucleus to give an unstable intermediate which undergoes radioactive decay to give the more stable Br How many electrons must the unstable intermediate Fe release to give the e nucleus according to the equation 32 35 32 Express your answer numerically as an integer Submit Hints My Answers Give Up Review Part

Explanation / Answer

part a

subtract 56 from 73. the difference in mass is due to the added neutrons

neutrons = 73-56 = 17

part b

elctrons = 32-26 = 6

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