Which diagram shows the correct distribution of electrons in the electron shells of magnesium atom?

For Magnesium the distribution of electrons is the following; two electrons in shell one, eight in shell two, and two more in shell three.

Magnesium has an atomic number of 12. Now for the first 18 elements we know that the 3rd shell can hold 8 electrons, the 2nd 8 and the first 2.

On Edgenuity is the third option.

the correct answer is option d

explanation:

i was wrong its d because they dont use cm when calculating square roots

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.