Chem: Geometric isomers and that. (:

Electronslive in orbitals. When an S and P orbitaljoin together, that makes a single bond.

Stereo Isomerism requires a double bond, and each carbon either side of it, to have two different things on it.

This type of stereo isomerismis known as geometric isomerism.

The two geometric isomer types are 'E', and 'Z'.

E/Z goes by molecular mass of things attached.

Z= The highest priority atoms/molecules TOGETHER.
E= The highest priority atoms/molecules OPPOSITE.

By highest priority, I mean highest mass.

So, a Z (together), would be, for e.g.:
H- -H
C=C
Cl- -Cl

(the '-' means a diagonal bondto the C, not a -ive ion.)
This would be because on both C's, the Cl has the biggest mass, and is therefore of priority, and they are both together on the same side.

An E would be:
Cl- -H
C=C
H- -Cl

Because, once again, the Cl is of greater mass on both Carbon, and they are therefore, of priority,andthey are at diagonals.

Instructions/Checklist for recognising Geometric Isomers:

1. Double Bond?
2. Does each carbon have two different things on it?
3. Which has the bigger mass on either side?
4. Are these together or opposite?

-Nin