Types of bonds

A chemical bond is a force of that holds together two or more atoms or ions. There are two types of bonds, covalent and ionic bond.

Covalent bonding involves a sharing of electrons.

• Single covalent bonding involves sharing of a pair of electrons between two atoms.


• Double covalent bonding involves sharing of 2 pairs of electrons between two atoms.


• triple covalent bonding involves sharing 3 pairs of electrons between two atoms.

Ionic bond is the electrostatic force of attraction between oppositely charged ions.

Source of the picture: biology( http://www.dwm.ks.edu.tw/bio/activelearner/02/ch2summary.html)

Chemical stability

Stability of Inert Gases:

Studies of inert gases revealed that thier atoms contain eight electrons in their outer energy level(except helium, which contains 2 electrons).

Valence Electrons:

Valence electron are the electrons found on the outer energy level . The number of valence electrons of an element is related to its position in the periodic table. This number has an important role in determining the properties of the element.

Lewis Electron-dot Symbol:

A lewis electron-dot symbol consists of the symbol for the element surrounded by dots, one for each valence electron. The number of dots placed around the symbol of the element is equal to the number of valence electrons.

source of the picture: The Periodic Table(http://facstaff.gpc.edu/~pgore/PhysicalScience/Periodic-table.html)

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