How many electrons will a calcium atom (Ca) lose in order to get a noble gas configuration?

To achieve a noble gas configuration, a calcium atom (Ca), which has 20 electrons, will lose two electrons. This is because calcium is in Group 2 of the periodic table and typically forms a +2 charge by losing its two outermost electrons.

Understanding Noble Gas Configuration

Noble gases, like neon and argon, have full outer electron shells, making them stable and unreactive. For calcium, the electron configuration is:

• 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²

Steps to Achieve Stability

By losing the two electrons in the 4s orbital, calcium transforms into a positively charged ion (Ca²⁺) with the electron configuration of argon:

• 1s² 2s² 2p⁶ 3s² 3p⁶

This loss of electrons allows calcium to mimic the stable electron arrangement of noble gases.