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Mar 23, 2020 at 19:10 comment added Mathew Mahindaratne @Ed V: Great comment to answer OP's question. I appreciate it. :-)
Mar 23, 2020 at 19:07 comment added Ed V Below germanium, you have tin and lead. Lead is a metal (no band gap), but tin has two allotropes: white tin is ordinary metallic tin, but gray tin has the diamond, Si, and Ge crystal structure and is not a metal. See the wiki article on ‘tin’. Metals have no band gap, but gray tin does.
Mar 23, 2020 at 18:00 comment added timeinbaku Thanks for the great answer, but I am curious as to why the band gap decreases going down a group?
Mar 23, 2020 at 17:59 vote accept timeinbaku
Mar 23, 2020 at 13:30 comment added Ed V +1 Excellent answer: at the right level of detail, without getting bogged down in the little band diagrams, Fermi levels, and on and on.
Mar 23, 2020 at 10:42 history answered Mathew Mahindaratne CC BY-SA 4.0