Oxygen is an element in the sixth group of the periodic table. This means it contains 6 electrons in its valence shell. Therefore, to complete its octet, it will prefer to gain two electrons rather than to donate 6. This is why its valency is -2. The relatively easy to achieve octet makes Oxygen a reactive element.
There are many reasons why it is important to monitor the environmental parameters. The activities of the humans had a great impact on the environment. Through monitoring, we will be able to understand and learn the factors that affect the environment and how to minimize it.
Well scientist have made the microscope and telescope and we have discover new bacteria and new plant(s) which has help a lot <span />
They provide information about the pasts of the animal and plants.
