A strong chemical bond is formed from the transfer or sharing of electrons between atomic centers and relies on the electrostatic attraction between the protons in nuclei and the electrons in the orbitals. The types of strong bond differ due to the difference in electronegativity of the constituent elements.
The name Nubia is of Egyptian origin. The meaning of Nubia is from Nubia Africa, gold. Nubia is generally used as a girl's name. It consists of 5 letters and 3 syllables and is pronounced Nu-bi-a. Transferred use of the name of an ancient kingdom in Africa, which in turn may have derived from the Egyptian word nbw meaning gold.
The area between the first and fourth cataracts is known to the Egyptians as Cush. To the Greeks, from Homer onwards, all the known people living south of Egypt are called Ethiopians (inhabiting the areas of modern Sudan and Ethiopia). Later again Sudan as far south as Khartoum becomes widely familiar under the Latin name Nubia. The whole region is rich in gold mines, and the name probably derives from the word for gold (nub in Mahasi, though this is only one among the many dialects of Nubia past and present).