Diatomic molecules are molecules composed only of two atom s, of either the same or different chemical element s. The prefix di-means two in Greek. Common diatomic molecules are hydrogen (H 2), nitrogen (N 2), oxygen (O 2), and carbon monoxide (CO).he bond in a homonuclear diatomic molecule is non-polar and covalent. In most diatomic molecules, the elements are nonidentical. Prominent examples include carbon monoxide, nitric oxide, and hydrogen chloride, but other important examples include MgO and NaCl.
Africa, which developed the world's oldest human civilization, gave humanity the use of fire a million and half to two million years ago. It is the home of the first tools, astronomy, jewelry, fishing, mathematics, crops, art, use of pigments, cutting and other pointed instruments and animal domestication.In short Africa gave the world human civilization.illions of years ago human life started in Africa, Australopithecus aphaeresis and Australopithecus africanus and Australopithecus robustus were all key rungs in the development of humanity.
The history of Africa begins with the emergence of Homo sapiens in East Africa, and continues into the present as a patchwork of diverse and politically developing nation states. The recorded history of early civilization arose in Egypt, and later in Nubia, the Sahel, the Maghreb and the Horn of Africa.During the Middle Ages, Islam spread through the regions. Crossing the Maghreb and the Sahel, a major center of Muslim culture was Timbuktu.uropean colonization of Africa developed rapidly in the Scramble for Africa of the late 19th and early 20th centuries. It is widely believed that Africa had up to 10,000 different states and autonomous groups with distinct languages and customs before it was colonized.