B. An ion with a negative charge
-1 , A neutral chlorine atom, for example, contains 17 protons and 17 electrons.
By adding one more electron we get a negatively charged Cl- ion with a net charge of -1.
When Chlorine Cl gains an electron it forms the negative ion called Chlorine ion Cl- .
Remember that when an atom gains an electron it forms an ion with a negative charge called anion.
If an atom loses or gains electrons, it will become a positively or negatively charged particle, called an ion.
The loss of one or more electrons results in more protons than electrons and an overall positively charged ion, called a cation.
Chlorine also has ten core electrons and valence electrons in the third energy level.
However, chlorine has seven valence electrons, one less than the noble gas argon, which has eight valence electrons.
Thus, chlorine will gain one electron, forming the anion, Cl–, and achieving a stable noble gas configuration.
Therefore, A chlorine atom gains an electron with an ion with a negative charge
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