Chemistry Guru - Chemistry Tuition | JC, A Level, H2 Chemistry Tuition How to draw Dot Cross Diagram for Simple Molecules and Ions - H2ChemHacks

Dot Cross Diagram is fundamental to determine how valence electrons are distributed between the atoms in a molecule or ion. There are 5 guidelines to help draw the dot cross diagram:
1. Central atom is the one that needs most additional electrons to be stable.
2. Central atom will distribute its electrons to surrounding atoms to make them stable
3. Atoms form the same number of bonds as the number of additional electrons required for stability
4. Central atom will expand octet to form more bonds if necessary
5. Adding or removing electrons for ions depends on electronegativity. For anions, electrons are added to more electronegative atoms. For cations, electrons are removed from less electronegative atoms.
To learn how to draw dot cross diagram in a systematic way, watch this video tutorial now!
Try it! Draw the dot cross diagram for NO3-, CO and O3!
Do you have any molecules or ions that you have difficulties in drawing the dot cross diagram? Share them in the comments section and let me try to solve them in a later video!

Topic: Chemical Bonding, Physical Chemistry, JC, H2, A Level Chemistry, Singapore

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How to draw Dot Cross Diagram for Simple Molecules and Ions - H2ChemHacks
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Education	Upload TimePublished on 20 Apr 2016