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Answered

Write electron configurations for these atoms and ions, and comment on the result.


a.) Ar

b.) Cl-

c.) S2-

d.) P3-

Verified Answer :

Edufirst
AAr, Z = 18 => 18 electrons => 1s2 2s2 2p6 3s2 3p6

b) Cl-

Cl, Z = 17 => Cl- = 17e + 1e = 18 electrons => same electron configuration as Ar

c) S2-

S, Z = 16 => S(2-) = 16e + 2e = 18 electrons => same electron configuration as Ar 

d) P(3-), Z= 15 => P(3-) = 15e + 3e  = 18 electrons => same electron configuration as Ar

Cl- ion has one more electron than Cl atom, S2- ion has two more electrons than S atom, and P3- has three more electrons than P atom.

Then the three ions have 18 electrons, which is the number electrons of Ar atoms, and therefore the 4 species have the same electron configuration of Ar.  

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