Naked Science Forum

Non Life Sciences => Chemistry => Topic started by: kle on 28/04/2007 22:02:18

Title: What is the electron configuration in an arsenic atom?
Post by: kle on 28/04/2007 22:02:18

Can someone please help me with these questions please?
1.Write the ground state electron configuration for an arsenic atom, showing the number of electrons in each subshell.
2.Give one permissible set of four quantum numbers for each of the outermost electrons in a single As atom when it is in its ground state.
3.Is an isolated arsenic atom in the ground state paramagnetic or diamagnetic? Explain briefly.
4.Explain how the electron configuration of the arsenic atom in the ground state is consistent with the existence of the following known compounds: Na3As, AsCl3, and AsF5.

Thank you very much

Title: Re: What is the electron configuration in an arsenic atom?
Post by: BillJx on 02/05/2007 02:43:44

If I answer your questions, do I get your course credits?

Title: Re: What is the electron configuration in an arsenic atom?
Post by: mark73 on 03/12/2008 12:46:32

Atomic theory: a new idea!
a curious coincidence is the relationship among number of nucleons of the neon (20, 10 protons + 10 neutrons) and the number of tetrahedron packing of the icosahedra (20).
http://coseinteressanti.altervista.org/IMM_3D/Elementi/10_Ne/20.bmp
http://coseinteressanti.altervista.org/IMM_3D/Elementi/10_Ne/20.c4d    (3d)
http://coseinteressanti.altervista.org/IMM_3D/Elementi/base/tetrag_insc.bmp (Reuleaux tetrahedron)

Title: Re: What is the electron configuration in an arsenic atom?
Post by: lyner on 03/12/2008 16:36:19

Why do we get so many more Chemistry students asking us to do do their work for them than Biology and Physics students?

Title: Re: What is the electron configuration in an arsenic atom?
Post by: Bored chemist on 03/12/2008 19:15:26

Chemistry is more difficult.
:-)

Title: Re: What is the electron configuration in an arsenic atom?
Post by: lyner on 03/12/2008 22:01:45

Piece of cake. The students just aren't up to it! [;D]

Title: Re: What is the electron configuration in an arsenic atom?
Post by: Chemistry4me on 03/12/2008 23:02:26

All I know is Qustion 1
1s² 2s²2p⁶ 3s²3p⁶3d¹⁰ 4s²4p³

Title: Re: What is the electron configuration in an arsenic atom?
Post by: Chemistry4me on 03/12/2008 23:10:26

For Q2 I presume that they are asking for the 4p³ electrons
n=4 l=1 m₁=-1 m_s=+1/2
n=4 l=1 m₁=0  m_s=+1/2
n=4 l=1 m₁=+1 m_s=+1/2
Hopefully this is correct [::)] [::)] [::)]

Title: Re: What is the electron configuration in an arsenic atom?
Post by: Chemistry4me on 03/12/2008 23:15:25

I found this...
http://wiki.answers.com/Q/Isolated_arsenic_atom_in_ground_state_paramagnetic_or_diamagnetic (ftp://http://wiki.answers.com/Q/Isolated_arsenic_atom_in_ground_state_paramagnetic_or_diamagnetic)
To be honest I've got know idea why that is (or even if its correct [???])

Title: Re: What is the electron configuration in an arsenic atom?
Post by: Chemistry4me on 03/12/2008 23:26:20

For Q4
Arsenic has 5 valence electrons, with 1 lone pair that isn't involved in bonding. Sodium donates one elctron each, so Na3As has an octet.
Same with AsCl₃, the chlorines all donates one elctron each so AsCl₃ has an octet. For AsF₅ , arsenic can have an extended octet and so can 'hold' 10 electron, each of the five valence electons is involved in bonding.