Anelement is placed in 2nd group and 3rd period table burns in rhe presence of oxygen to firm basic oxide. a) Identify the element b) Write the balanced eqn when it burns in presence of air. c) Write a balance eqn when this oxide is dissolved in water. d) Draw the electron dot structure for the formation of this oxide.




Oxygen makes up nearly half of the Earth's crust mass and 86% of the mass of the Ocean.  That alone makes it a very important element.  Then we add the fact that we need it to breathe, and we see the importance of oxygen.

On Earth the production of oxygen gas (also called elemental oxygen) comes from photosynthesis carried out by plants and algae.   In this experiment, we will prepare it by using a decomposition reactio