(3) a) Using Slater’s rule, which of these electrons experiences a higher effective nuclear charge: a 4s electron of cal

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(3)
a) Using Slater’s rule, which of these electrons experiences a
higher effective nuclear charge: a 4s electron of calcium or a 3d
electron of cobalt? (4 marks)
(b) Using Slater’s rule,which of the elements Ca or Co would you
expect to have a lower first ionisation energy? Explain your choice
(3marks)
Please help and explain as detailed as possible please