A trick is to count up valence electrons, then count up the number of electrons needed to complete the octet rule ( or with hydrogen just 2 electrons ), then take the difference of these two numbers and the answer is the number of electrons that make up the bonds.
32.
The "'octet rule "'is a chemical rule of thumb that reflects observation that atoms of main-group elements tend to combine in such a way that each atom has eight electrons in its valence shell, giving it the same electronic configuration as a noble gas.
33.
Or does the fact that the iodine is " crowded " provide an exception to the octet rule ? ( Too bad astatine isn't stable enough to see if we could get AtF8 . . . damn you radioactivity . ) talk ) 05 : 06, 2 September 2009 ( UTC)
34.
They can be thought of as abbreviated Lewis structures observing the following conventions : ( 1 ) carbon atoms are indicated as the terminus of a line segment or meeting point of line segments; ( 2 ) hydrogen atoms connected to carbon are omitted, with the presumption that each carbons atom is bonded to the number of hydrogen atoms that would bring its valence to 4 ( or as close to satisfying the octet rule as other electronic details allow ).
35.
For example, in the sulfur hexafluoride molecule ( SF 6 ), Pauling considered that the sulfur forms 6 true two-electron bonds using so-called sp 3 d 2 quantum-mechanical calculations on this and similar molecules have shown that the role of d orbitals in the bonding is minimal, and that the SF 6 molecule should be described as having 6 polar covalent ( partly ionic ) bonds made from only four orbitals on sulfur ( one s and three p ) in accordance with the octet rule, together with six orbitals on the fluorines.
36.
Because the way I see it, the total sum of the enthalpy of K + and the kinetic energy of the electron is definitely greater that the enthalpy of K, but maybe the enthalpy of the ion itself ( without the kinetic energy of the electron ) is less than K . Because when you think about it in a simple non-thermodynamic point of view, potassium ( or any alkaline metal for that matter ) is definitely unstable in its atomic form, and is definitely happier in its ionic form because of the octet rule, so you could say that K + is more stable than K, right?
