Explain complete the octet making it a tetrahedral

Reference no: EM13302142

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?

Reference no: EM13302142

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