Missing line in solar spectrum
The picture is a mocked-up fake and is not an actual picture of the solar spectrum. You can easily see this because the black &quot;Fraunhofer lines&quot; extend beyond the spectrum and H alpha should have an appreciable width.
The table is massively incomplete. It list only a tiny fraction (the strongest) absorption lines in the solar spectrum. There are thousands of others.
I guess whoever mocked up the spectrum didn't use that table.
A real solar spectrum is shown below. The Fraunhofer lines are not easy to see at all in a spectrum that has low enough resolution to include the whole thing in one linear image. Any lines due to mercury will be weak because mercury is not an abundant element in the solar photosphere.

A better view is offered by an echellogram taken at higher resolution. This begins to demonstrate just how many lines there are in the solar spectrum.