Electron Configuration
I. Write the electron configuration for each of the following elements (these are not real
elements, but their atomic number is indicated for you to work out the electronic structure).
Please use the configuration based on the correct energy levels.
a.
b.
9Tt
21Nm
48ZZ
CHEM40079 Term 2 2023
Student Number
Assessment 2
Name
(10 marks)
(6 marks)
Page 2 of 13
II. A student, who identified the electron configuration for Rf (fictitious) as 15² 25² 2p 3s² 3pº 3d¹° 4s²4pº 4d¹,
was marked as incorrect. Write the correct electron configuration for Rf (2 mark) and demonstrate why,
based on your knowledge of electronic energy levels, the configuration given by the student cannot be
correct. (2 marks)
Fig: 1