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PH3 (Phosphine) would be a P atom, with 5 crosses around its shell. Then three H atoms would be attached to it, with one atom per cross. This should leave two crosses free. Then, in each H atom, draw a dot, but make sure its also touching the P atom.

BCl3 (Boron TriChloride) would be a B atom, with 3 crosses on its shell. Then, one Cl atom per cross. On each Cl atom, draw 7 dots, with one each touching the B atom.

Hopefully this makes sense.

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Q: How do you draw a dot cross diagram of Bcl3 and PH3?
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