define the octet rule

Exceptions to the Octet Rule - While the octet rule is very useful for describing bonding in a large number of compounds, there are many exceptions to this rule..

Where duplet is formed? A hydrogen atom has only one electron in its valence shell. It needs one more electron to fill its valence shell. The completed shell has the electronic arrangement of the noble gas helium, yet an octet is not completed. However we still get a stable m..

The elements belonging to groups 15, 16 and 17 have more than four electrons in their valence (outermost) shell. The elements of these groups form stable compounds in which there are more than eight electrons around the central atom. For example PF 5 , PCl 5 , IF 6 and SF 6 are some typical com..

>The outermost shell of an atom cannot accommodate more than 8 electrons, even if it has a capacity to accommodate more electrons. This is a very important rule and is also called the Octet rule. The presence of 8 electrons in the outermost shell makes the atom very st..

Find the rule. => subtract 1 or add 2 or subtract 2 or add 1..

Find the rule. => subtract 5 or add 3 or add 5 or subtract 4..

Identify the rule. => subtract 2 or add 8 or subtract 8 or add 3..

Identify the rule. => subtract 7 or add 7 or subtract 6 or add 6..

Rule 1 - When four different atoms are attached to the chiral carbon, priority depends on atomic number. The atom with the highest atomic number gets top priority. If the two atoms are isotopes of the same element, the atom of higher mass number has higher priorit..

If two atoms attached to the chiral carbon atom are same, priority cannot be decided according to rule 1. The atoms attached to each of these first atoms need to be compared. For e.g., in sec-butyl chloride consider the methyl group CH 3 . The second atoms attached to the methyl carbon..