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Which particle has the same electron configuration as a potassium ion?
A. fluoride ion
B. sodium ion
C. neon atom
D. argon atom

Sagot :

Argon atom has the same electrons configuration as a potassium ion.
Ishankahps

Answer is D - Argon atom


Potassium has atomic number as 19. Hence, number of protons = 19

If the atom is neutral,

number of protons = number of electrons = 19


Hence, the electron configuration of potassium (K) is

1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹


Potassium ion is formed by losing an electron. Then the number of electrons = 19 - 1 = 18


Electron configuration of K⁺ is 1s² 2s² 2p⁶ 3s² 3p⁶.


This is same as the electron configuration of Ar which has 18 electrons.

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