Final answer:
Ions such as Na+, F-, Ca2+, and Cl- share electron configurations with noble gases like neon and argon by losing or gaining electrons to achieve a full octet.
Step-by-step explanation:
The ions that share an electron configuration with a noble gas are those that have achieved a full octet through the gain or loss of electrons. For example:
- Na+: This ion forms when a sodium atom loses one electron, resulting in the electron configuration of [Ne], which is the noble gas configuration of neon.
- F-: A fluoride ion forms when a fluorine atom gains one electron, achieving the electron configuration of [Ne], the noble gas configuration of neon as well.
- Ca2+: This ion is formed when a calcium atom loses two electrons, attaining the electron configuration of [Ar], which corresponds to the noble gas argon.
- Cl-: When a chlorine atom gains an electron, it obtains the electron configuration of [Ar], mirroring the noble gas configuration of argon.
All of these ions have electron configurations resembling the closest noble gases on the periodic table, having either lost or gained electrons to achieve a full outer shell.