I believe this is the electric configuration for magnesium, so, In writing the electron configuration for Magnesium the first two electrons will go in the 1s orbital. Since 1s can only hold two electrons the next 2 electrons for magnesium go in the 2s orbital. The next six electrons will go in the 2p orbital. The p orbital can hold up to six electrons. We'll put six in the 2p orbital and then put the remaining two electrons in the 3s. Therefore the Magnesium electron configuration will be 1s22s22p63s2.
The answer is B
The entity which is represented by X in the partial electron configuration of an atom with 12 electrons as shown in 1s² 2s² 2p⁶ X is; 3s²
According to the question, the partial electronic configuration of an atom with 12 electrons is shown as follows;
According to the Aufbau's principle, electrons are filled into orbitals with the lowest energy before those of higher Energy are filled.
The shell with energy level 2 has 2 subshells(orbitals) namely the 2s and 2p orbitals with a maximum of 2 and 6 electrons respectively.
The 2 electrons left will be filled into the 3s orbital.
Therefore, X represents 3s².
The electronic configuration is therefore;
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