Question

Write the subshell electronic configuration of 12Mg and find block and period.​

Answer 1

Answer:

Notation for example,if two electrons are filled in the 's' subshell of the first shell the resulting notation is '1s2' with the help of these sub shell labels,the electron configuration of magnesium (atomic number 12) can be written as 1s2 2s2 2p6 3s2.

Answer 2

The subshell electronic configuration of $\[{}_{12}Mg\]$ is $\[1{s^2}\,2{s^2}\,2{p^6}\,3{s^2}\]$. The block is s-block and the period is 3.

Explanation:

• The atomic number of magnesium is 12. It has 12 protons, 12 neutrons and 12 electrons in its atom.
• According to Aufbau's principle, the subshell electronic configuration of $\[{}_{12}Mg\]$ for 12 electrons is $\[1{s^2}\,2{s^2}\,2{p^6}\,3{s^2}\]$.
• Magnesium is an alkaline earth metal.
• The outermost shell of magnesium has 2 electrons, therefore, it belongs to group 2.  
• The last electron goes in s-subshell, therefore, it belongs to the s-block.
• The outermost electron goes into the third shell. Therefore, it belongs to the third period.