1. Calcium's Electronic Configuration:
* Calcium (Ca) has an atomic number of 20.
* Its electronic configuration is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s².
2. Pseudo-Noble-Gas Configuration:
* A pseudo-noble-gas configuration resembles the electron configuration of a noble gas but may have a slightly different number of electrons in the outermost shell.
* The nearest noble gas to calcium is Argon (Ar), with an electronic configuration of 1s² 2s² 2p⁶ 3s² 3p⁶.
* To achieve this configuration, calcium needs to lose its two 4s electrons.
3. Ion Formation:
* When calcium loses two electrons, it becomes a positively charged ion (cation).
* The charge of the ion is +2, representing the two lost electrons.
4. Formula of the Ion:
* The formula of the ion formed is Ca²⁺.
