Why does the octet rule exist?
The octet rule exists because the atoms of many elements become more stable by attaining a noble gas electron configuration.
Most noble gases have eight valence electrons (He has only 2) which gives them a full outer shell of electrons in the s and p sublevels of their highest energy level.
The elements near neon on the periodic table will form compounds in order to add or lose electrons to achieve an electron configuration which matches that of neon.
F can add one additional electron by forming a single covalent bond with another atom. This occurs when F atoms bond to each other when forming a diatomic molecule (F-F).
There are elements which are exceptions to the octet rule which do not require 8 valence electrons to be stable. Hydrogen needs only two valence electrons to fill its 1s sublevel, so H atoms form just one covalent bond.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
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