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Most chem PhDs don’t even know the whole thing lol. We had to memorize just the symbols in high school, but positions weren’t required. In my grad-level inorg course, the first test was a blank table that we had to fill in, but even then the f-block and transactinides were not required.
It worked so well I managed to retain that knowledge for almost a full week after we were tested on it lol it’s all gone now