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Here are the dot and cross diagrams for the molecules you requested:
Hydrogen Sulphide (H₂S)
H: :S: H
Ammonia (NH₃)
H
|
H:N:H
|
H
Ammonium Ion (NH₄⁺)
H
|
H:N:H
|
H
⁺
Ethane (C₂H₆)
H H
/
H:C:C:H
/
H H
Carbon (IV) Oxide (CO₂)
O::C::O