Answer: MgO is the element with the highest chemical activity. Its atomic number is 12, placing it in the modern periodic table’s 2nd group 2 and 3rd period.
Formation of magnesium oxide (MgO) through electron transfer-
When magnesium combines with oxygen, its two outermost electrons are transferred to an oxygen atom. The magnesium atoms lose two electrons to produce a magnesium ion (Mg2+), while the oxygen atom gains two electrons to form an oxide ion (O2-).
Structure Of Electron Dots For The Formation Of Magnesium Oxide-