Answer
$^{40} K, ^{91}Zr, ^{121}Sb$ and $^{143}Nd$
Work Step by Step
A nucleus that has one nucleon outside a filled shell is the element with one more than magic number of neutrons or protons. Magic numbers are $2, 8, 20, 28, 50, 82, $ and $126$
Now let's analyze the neutron number and proton number of each the elements.
$^{40} K$
Neutron : 21 (One more than Magic number)
Proton : 19
$^{91}Zr $
Neutron : 51 (One more than Magic number)
Proton : 40
$^{121}Sb$
Neutron : 70
Proton : 51 (One more than Magic number)
$^{143}Nd$
Neutron : 83 (One more than Magic number)
Proton : 60
