________ is isoelectronic with argon. K O2- S2- Cl2- K-

Question

Question

Answer 1

Answer #1

Number of electron in Ar is 18

For K:
Atomic number of K = 19
So, number of electrons in K = 19

For O2-:
Atomic number of O = 8
So, number of electrons in O = 8
Since charge on O is -2
Number of electrons in O2- = 10

For S2-:
Atomic number of S = 16
So, number of electrons in S = 16
Since charge on S is -2
Number of electrons in S2- = 18

For Cl2-:
Atomic number of Cl = 17
So, number of electrons in Cl = 17
Since charge on Cl is -2
Number of electrons in Cl2- = 19

For K-:
Atomic number of K = 19
So, number of electrons in K = 19
Since charge on K is -1
Number of electrons in K- = 20

S2- and Ar has same number of electrons. So, they are isoelectronic.

Answer: S2-

Answer 2

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