Predict the shape of alh3 using vsepr draw structure with, Ask an Expert

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Predict the shape of AlH3 using VSEPR, draw structure with perspective and indicate if polar. 1) I don't understand don't we draw a lewis structure first and add 2 lone pairs to complete the octet making it a tetrahedral? how does it only have 3 covalent bonds? it doesn't need to complete an octet rule first? is Al an exception like B?

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