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Question : 19
Total: 26
(i) A radioactive nucleus ' A
A
A 1
A 2
A 3
A 4
The mass number and atomic number ofA 2
Determine the mass and atomic numbers ofA 4 A
(ii) Write the basic nuclear processes underlyingβ + β −
The mass number and atomic number of
Determine the mass and atomic numbers of
(ii) Write the basic nuclear processes underlying
Solution:
(i) Determining the mass and atomic number of A 4 A
(ii) Basic nuclear processes ofβ + β −
(i)A 4 :
Atomic Number : 69
A : Mass Number : 180
Atomic Number : 72
[Alternatively : Give full credit if student considers decay and find atomic and mass numbers accordingly
72 180 A
70 176 A 1
71 176 A 2
69 172 A 3
69 172 A 4
Gives the values quoted above.
If the student takesβ +
72 180 A
70 176 A 1
71 176 A 2
69 172 A 3
69 172 A 4
This would give the answers:( A 4 : 172 , 69 ) ; ( A : 180 , 74 ) ]
(ii) Basic nuclear process forβ + p → n + 1 0 e + v
Forβ − n → p + − 1 0 e + v
[Note: Give full credit of this part, if student writes the processes as conversion of proton into neutron for decay and neutron into proton for decay.]
(ii) Basic nuclear processes of
(i)
Atomic Number : 69
A : Mass Number : 180
Atomic Number : 72
[Alternatively : Give full credit if student considers decay and find atomic and mass numbers accordingly
Gives the values quoted above.
If the student takes
This would give the answers:
(ii) Basic nuclear process for
For
[Note: Give full credit of this part, if student writes the processes as conversion of proton into neutron for decay and neutron into proton for decay.]
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