Covalent bonding
This is pretty risky--I know what are covalent bonds. But i don't exactly know how to explain them. So all the best to me and you who may be confused after reading this.

• Covalent bonding is the sharing of electrons.
  
• It is a bond between non-metals and non-metals. Metals!! SIAM!!!
  
  
• Okay. Here's my shot at it. We know the Chlorine has 7 electrons in its outermost shell and needs one more electron to fulfil the octet configuration. Right? Say yes.
  therefore the electronic configuration looks like this:
  

If you want the two chlorines to bond together, they can't by ionic bonding because both have a negative charge and will never have no charge when they are bonded ionically. Do i make sense? i think i do.

therefore they share electrons instead. How ar? how? In the case of Chlorine, they share ONE pair of electrons. Like that both also got 8 electrons on the outer shell.

When they share, when counting the number of electrons in the outermost shell, you MUST include the one shared, meaning the one the other atom nice nice share with you. if not share for what. aiyo.
So it looks like this:

The shared ones is the one in the middle. It's just like when a couple get married they start to share room, share spoon(y), fork, towel, soap, house, and of course, bed! hoho. p/s: You DO know marriage is a kind of bond right? please say yes.

• I forgot one thing. The electrons at the outermost shell is called the valence electrons.
• You all want to try how CO2 bonds? I don't care. Say yes. It's kind of math. So must practise. I don't care. die die also must practise. if not you die not my fault.

Co2 de bond will look like this:


Wah...you see carbon got 2 wives leh. see the price to pay for having an affair? Must handle more things. Must be more devoted like Cl2 lar!

You all got basic idea? I hope la hor. I try my best liao. I know the drawing sucks but you can't blame paint. It's a poor thing program already.

Properties of Covalent Bonds

• Volability (how well they evaporate): This one must depend on the molecular structures. The stronger the molecular structures, the higher the boiling point. I'll explain molecular structures in the next post. dying already. Who? Me la.
  
  
• Solubility: Mostly insoluble in water, but hor, got some super extra ones want to make us study more so they can be soluble. Eg. Sugar and alcohol. Then those with simple molecular structures normally dissolve in organic solvents. You only need to know organic solvents by name. tell you what they are not only you die, i also die with you.
  
  
• Electrical conductivity: For electicity to travel, must have free electrons flying around so there's ions. But covalent bonding, you also know, share with so many concubines also don't have any flying around liao, so can't conduct electricity. HOWEVER, sway sway hor, graphite, allotrope of carbon also want to be extra then can conduct electricity leh! I tomorrow then explain what is allotrope. Today brain cannot absorb too much. because it's friday night. THEN HOR, got other extra ones leh. Hydrogen Chloride and hydrogen sulphide can conduct electricity when dissolved in water. sway sway. memorise lor. bo bian
  
  
  Nothing more to say liao. Tomorrow then flood you all. Talk more i also no brain already. BYE!!!