This report on Door Lock & Lockset Manufacturing: 1  Provides Market Size information to assist with planning and strategic decisions. 2  Includes the necessary information to perform SWOT, PEST and STEER analysis. 3  Helps you understand market dynamics to give you a deeper understanding of industry competition and the supply chain.
Look at the number of bonding domains. for example, Calcium has a charge of +2 and oxygen has a charge of -2. They bond, and calcium gives up 2 electrons to the same oxygen, creating a double bond, forming a binary compound (Calcium Oxide) It all depends on the elements. The main thing is the number of electrons being transfered.
One example of a double bond is as close as your nose: dioxygen gas (O=O, or O2), which you are breathing right now. Because carbon has a valence of 4, it can form two or three bonds with another carbon atom, and still be able to bond other atoms. In the figure above, notice that the ball-and-stick models do not show two or three sticks to correspond to double and triple bonds.