Question

Hafnium, Hf, is also found in group 4B. Write the electron configuration for Hf. Express your answer in order of increasing orbital energy as a string without blank space between orbitals. For example, the electron configuration of Li could be entered as 1s^22s^1 or [He]2s^1.

Answer 1

The electron configuration for Hafnium (Hf) is [Xe]6s²4f¹⁴5d².

Step-by-step explanation:

The electron configuration for Hafnium (Hf) can be determined by looking at its position in the periodic table. Hafnium is in group 4B, which means it has 4 valence electrons. To write the electron configuration, we start with the noble gas that comes before Hafnium, which is Xenon (Xe).

The electron configuration for Hafnium, therefore, is [Xe]6s24f145d2.

Answer 2

Answer:
`1s^22s^22p^63s^23p^64s^23d^(10)4p^65s^24d^(10)5p^66s^24f^(14)5d^2`

Step-by-step explanation:

Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom.

The electrons are filled according to Afbau's rule in order of increasing energies and thus the electronic configuration for Hafnium with atomic number of 72 and containing 72 electrons is:

`1s^22s^22p^63s^23p^64s^23d^(10)4p^65s^24d^(10)5p^66s^24f^(14)5d^2`

The electronic configuration for Hafnium in terms of nearest noble gas Is

`[Xe]6s^24f^1{14}5d^2`