1s2 2s2 2p6 3s2 3p6
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Ions derived from representative elements achieve stability by gaining or losing electrons to achieve a full outer electron shell. For example, Group 1 elements tend to form +1 ions by losing one electron to achieve a noble gas configuration, while Group 17 elements tend to form -1 ions by gaining one electron. This process allows the ions to attain a more stable electron configuration similar to that of a noble gas.
The rule you are referring to is the octet rule. It states that representative elements tend to form chemical bonds in a way that they achieve a stable electron configuration with eight electrons in their outermost shell. This provides the atoms with greater stability and is commonly observed in elements that are not in the transition metals group.
The maximum number of electrons that a representative element can possess is 8. This is because the outermost electron shell of these elements can hold a maximum of 8 electrons in order to achieve a stable electron configuration.
Elements tend not to undergo chemical reactions that decrease stability. Chemical reactions typically result in products that are more stable than the reactants involved. Elements tend to form compounds to achieve a more stable electron configuration.
Because emission spectrum are the result of the electron configuration of the element and no two elements have exactly the same electron configuration.
Electron configurations are only made for pure elements. The electron configuration for Hydrogen is 1s1. The electron configuration for Oxygen is 1s2 2s2 2p4