I am making steady progress across the transition elements and my aim is to finish the d-block by the end of the year. Some that I don’t yet have designs for are:
Seaborgium
Technetium
Rhenium
Platinum
Bohrium
Rutherfordium
Vanadium
Titanium
If you have any ideas for these (or any others you haven’t yet seen), I would be pleased to hear from you.
Please post below, or email me on periodically.blog@btinternet.com
Thank you
periodically.blog 
May I suggest the taijitu – the yin and yang symbol – for the element Bohrium. Bohrium is named after the Danish physicist Niels Bohr, and he chose that symbol as part of his coat of armor when he recceived the Order of the Elephant (Denmark’s highest-ranked honour). It symbolises his view of nature that “opposites are complementary”.
Some links showing the coat of armor (text in Danish though):
https://denstoredanske.lex.dk/Niels_Bohr
https://videnskab.dk/kultur-samfund/niels-bohr-var-til-yin-og-yang
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Seaborgium – he was involved in making the atom bomb so maybe a Trinity symbol, or an atom bomb explosion, or the obelisk at the detonation site? https://twitter.com/ChemistryKit/status/943699888394637312/photo/1
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If you are looking for an idea for Chromium this was a popular element in pigments used by many impressionist painters, in particular Van Gogh and his famous yellow sunflowers…
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