Determine if the following expressions are true or false: True or false 1. Be is the only element of Group 2A that forms covalent compounds. 2. Al forms only tetrahedral compounds. 3. B is metalloid and semiconductor. 4. The SiO44‒ ion is tetrahedral. 5. In compound N2O5, nitrogen has an oxidation number of +5. 6. P forms only covalent compounds. 7. H3PO3 is triprotic acid. 8. HClO4 is explosive. 9. Br2 (l) oxidizes I2 (s). 10. The XeF4 molecule is tetrahedral.

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