What element represented by the bohr model below?

What diagram shows the ionic compound of magnesium oxide

Based on its chemical properties, identify the position of each chemical family on the periodic table.

Which of the following natural processes is most likely to support the formation of an underwater sinkhole? a pollution buildup from deposited minerals b limestone cave collapsing due to changes in sea level c erosion of large amounts of sand moved by ocean waves d oxidation of rock formed by chemical weathering