Which of the following particles does not have the same electron configuration as the others?

A. K+
B. Ar
C. Cl^1-
D. Al^3+

D. Al^3+

Explanation:

All the other elements given have the same number of elecetron

K has 19 electrons, since it is given as K+, it means that K has lost one electon, therefore K has 18 electrons now

Cl has 17 electrond, since it is given Cl^1- it means Cl has gained one electron , therefore now Cl has 18 electrons

Ar normally has 18 electrons

Al has 13 electrons, since it is given has Al^3+ it means Al has lost 3 electons, therefore now Al has only 10 electrons

In oder to answer this question easily it is must to know first 20 elements of the Modern Peroidic Table

the answer to your question is c

the electron configuration that you gave me has 16 electrons ergo it has 16 protons ergo it is the element sulfur.