write a neutral specie which is isoelectronic chlorides.

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You need to clarify your question and I would suggest you repost as a new question.
Species Name: Isochloride

Chemical Formula: XCl (where X represents the symbol for an element)

Description:
Isochloride is a hypothetical neutral species that is isoelectronic with chlorides. Isoelectronic species have the same number of electrons, and in this case, Isochloride possesses the same electron configuration as chloride ions (Cl-). However, unlike chloride ions, which carry a negative charge, Isochloride is electrically neutral.

Properties:

Isoelectronic with Chloride: Isochloride has the same electron configuration as chloride ions, with a total of 18 electrons (assuming the octet rule). This makes it isoelectronic with noble gas neon (Ne).

Single Negative Charge: While chloride ions (Cl-) carry a single negative charge, Isochloride lacks any charge and therefore has no net electrical charge.

Electron Configuration: Isochloride has a stable electron configuration with two electrons in the 1s orbital, and eight electrons in the 2s and 2p orbitals, similar to the electron configuration of neon (Ne).

Chemical Reactivity: Isochloride's chemical reactivity is expected to be similar to that of chloride ions. It may participate in ionic or covalent bonding depending on the nature of the element X.

Ionization Potential: Isochloride will have a higher ionization potential compared to chloride ions, as it requires the removal of an additional electron to form a cation.

Examples:

Isochloride of Oxygen: OCl
Isochloride of Sulfur: SCl
Isochloride of Phosphorus: PCl
Isochloride of Silicon: SiCl
Note: While the concept of isoelectronic species can be applied to various elements, the specific properties and reactivity of Isochloride will depend on the nature of the element X.
Disclaimer: The above information is for educational purposes only and is not intended to be used for any scientific or commercial applications.