What valency will be shown by an element having atomic number 12 ?

Explanation

To find out the valency of the element, we will have to write down its electronic configuration. Now, the atomic number of this element is 12, so its electronic configuration will be `underset("2, 8, 2")("K L M")`
It has 2 electrons in its outermost shell (M shell). So, one atom of this element can lose 2 electrons to achieve the nearest inert gas electron arrangement of 2,8. Since one atom of the element loses 2 electrons to achieve the inert gas electron configuration, so its valency is 2. It is divalent. (The element having atomic number 12 is actually magnesium).