SSC MTS EXAM

Detailed explanation-1: -The correct answer is: Electrons are shared to fill outer electron shells.

Detailed explanation-2: -When two atoms share electrons to fill their outer shells, it is called a covalent bond. A covalent bond is when atoms share one or more electrons. Covalent bonds form because the energy exerted to stay together is much less than the energy needed to break them apart and form isolated atoms.

Detailed explanation-3: -A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms. These electrons are simultaneously attracted by the two atomic nuclei. A covalent bond forms when the difference between the electronegativities of two atoms is too small for an electron transfer to occur to form ions.

Detailed explanation-4: -Formation of covalent compounds e.g Oxygen has six electrons in the outermost shell. It needs two electrons to complete the octet. Oxygen shares two electrons with another oxygen atom to complete the octet.