Question

Use the periodic table to write electron configurations for each of the following elements.

Fe Express your answer in condensed form in order of increasing orbital energy as a string without blank space between orbitals. For example, [He]2s22p6 should be entered as [He]2s^22p^6

Ba Express your answer in condensed form in order of increasing orbital energy as a string without blank space between orbitals. For example, [He]2s22p6 should be entered as [He]2s^22p^6.

Tl Express your answer in condensed form in order of increasing orbital energy as a string without blank space between orbitals. For example, [He]2s22p6 should be entered as [He]2s^22p^6.

Answer 1

1)

Number of electron in Fe = 26

Electronic configuration is 1s2 2s2 2p6 3s2 3p6 3d6 4s2

Noble gas having lesser electron than Fe and closest to it is Argon (Ar)

Number of electron in Ar = 18

electronic configuration of Ar is: 1s2 2s2 2p6 3s2 3p6

So, electronic configuration of Fe in noble gas form is: [Ar] 3d6 4s2

Answer: [Ar]3d^64s2

2)

Number of electron in Ba = 56

Electronic configuration is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 6s2

Noble gas having lesser electron than Ba and closest to it is Xenon (Xe)

Number of electron in Xe = 54

electronic configuration of Xe is: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6

So, electronic configuration of Ba in noble gas form is: [Xe] 6s2

Answer: [Xe]6s^2

3)

Number of electron in Tl = 81

Electronic configuration is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p1

Noble gas having lesser electron than Tl and closest to it is Xenon (Xe)

Number of electron in Xe = 54

electronic configuration of Xe is: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6

So, electronic configuration of Tl in noble gas form is: [Xe] 4f14 5d10 6s2 6p1

Answer: [Xe]4f^145d^106s^26p^1