Example: Hydrogen has one valence electron. Its electronic configuration is 1s1. Oxygen is a Group 6 atom so it has six valence electrons. Hydrogen needs 1 more electron to achieve stable octet structure so it offers to share one electron while oxygen needs two more electrons to achieve stable octet structure so it offers to share two electrons with 4 lone pairs.
Your Lewis Dot Cross Diagram should look something like this.
Example two: Methane
Carbon is a Group 4 atom while hydrogen is a Group 1 electron. Carbon has 4 valence electrons and it needs 4 more electrons to achieve a stable electronic configuration so it shares 4 electrons. Hydrogen needs 1 more electron to achieve a stable electronic configuration so it shares 1 electron.
Your Lewis Dot-Cross Diagram should look something like this.
How to draw Lewis Dot-Cross diagrams of water and ammonia
And REMEMBER, ALWAYS have your "legend" after you complete your Lewis Dot-Cross Diagram.
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