How well should i know the periodic table?

I plan on memorizing the principal groups (1-8A). But do I need to know the atomic number for each one of the elements? I’d be fine with the ones in the first 4 periods but i don’t know about the rest…

it is usally given for atomic masses. you have to know the places of nearly all of them because they ask about ionization trends w/o a table

ahh, ok. that’s good ig! tyy

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