Friday, May 18, 2012

Chemistry Review #9


9.  The octet rule is a rule which states that elements like to have their valence shells completely full, which gives them the same composition as a noble gas. 

a.  In order for an element to achieve an octet and mimic the composition of a noble gas, the valence shell must be full.

B  Elements with only one shell, the rule of the first shell of electrons or s orbitals, defies the octet rule.  Within this rule, helium, hydrogen and Lithium; helium is content with its two electrons filling the first shell, hydrogen needs to gain one to fill its shell, and lithium also needs to gain one to fill its shell.

c.  Elements in the 3,4,5,6, and 7 periods can expand their octet because their electrons can absorb more energy and move to a higher energy level.   

2 comments:

  1. Good job Cameron on your post! You have done a great job explaining the octet rule. However, i would like to add that it is the metals who lose their valance electrons, while non-metals either gain the electrons - which form anions - or they share the electrons with other non-metals. Keep up the good work!

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  2. Very good job on your post Cameron! I agree with what Zoe says. Also, on B, I am a little confused on what you meant by "Elements with only one shell, the rule of the first shell of electrons or s orbitals" If you could clear that up for me that would be great! Good work!

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