Predict the electron configuration of the unlikely ion Si^2-? a) [Ne] 3s^2 3p^1

Question

Predict the electron configuration of the unlikely ion Si^2-? a) [Ne] 3s^2 3p^1 b) [Ne] 3s^2 3p^2 c) [Ne] 3s^2 3p^3 d) [Ne] 3s^2 3p^4 e) [Ne] 3s^2 3p^5 The number of unpaired electrons in a neutral atom of chlorine is: a) none b) one c) two d) three e) four Which neutral atom of an element has 1 unpaired electron? a) K b) Sc c) H d) Ga e) all of the above What do the following ions have in common: N^3-, O^2-, F^-, Na^+. Mg^2+, Al^3+? a) they are isoelectronic b) they each have a noble gas electron configuration c) they are relatively stable and unreactive compared to the neutral element d) they are all found combined with other elements in nature e) all of the above are true What is the ground state M.O. electron configuration of C_2? a) sigma_1s^2 sigma*_1s^2 pi_2py^2 pi*_2pi^2 sigma_2s^2 sigma *_2s ^2 b) sigma_1s^2 sigma*_1s^2 sigma_2s^2 sigma *_2s ^2 pi_2py^2 pi*_2pi^2 c) sigma_1s^2 sigma*_1s^2 sigma_2s^2 sigma *_2s ^2 pi_2py^2 pi*_2pi^2 d) sigma_1s^2 sigma*_1s^2 sigma_2s^2 sigma *_2s ^2 pi_2py^2 pi*_2pi^2 e) sigma_1s^2 sigma*_1s^2 sigma_2s^2 sigma *_2s ^2 pi_2py^2 pi*_2s^2 Paramagnetic materials have unpaired electrons and are weakly attracted by magnetic fields, whereas diamagnetic materials have no unpaired electrons and are weakly repelled by such fields. By considering the molecular orbital diagram of the "diatomic" molecules below, determine which are paramagnetic. a) B_2 b) C_2 c) N_2 d) O_2 e) F_2

Explanation / Answer

27. The atomic number of silicon, Si is 14. The electronic configuration of Si is [Ne] 3s2 3p2

After getting two extra electrons it will become Si2-.

Hence the electron configuration of Si2- is [Ne] 3s2 3p4.

28. The atomic number of the neutral atom of chlorine, Cl is 17.

The electronic configuration of a neutral atom of chlorine is 1s2 2s2 2p6 3s2 3p5.

Here the sub-shells 1s, 2s, 2p and 3s are fully filled. The 3p sub-shell contains three orbitals which can accommodate 6 electrons.

But, there are 5 electrons, hence one orbital of 3p sub-shell is unpaired.

So, the number of unpaired electrons in the neutral atom od chlorine is; one.

29. The electronic configuration of K, Sc, H and Ga are given below:

K: [Ar] 4s1

Sc: [Ar] 4s2 3d1

H: 1s1

Ga: [Ar] 3d104s24p1

Hence, all of the above neutral atoms of an element has 1 unpaired electrons.

30. The number of electrons in N3- is 10

O2- is 10

F- is 10

Na+ is 10

Mg2+ is 10

and Al3+ is 10

Hence, ther are isoelectronic

they each have a noble gas electronic configuration

they are relatively stable and unreactive compared to the neutral elements

they are all found combined with other elements in nature.

So, the answer is: all of the above are true.

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