Pomocy, klasa 7 chemia, w załączniku macie ss zadania, proszę jak najszybciej!!!
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fluor F 9 19 9 9 10 19u
cynk Zn 30 65 30 30 35 65u
fosfor P 15 31 15 15 16 31u
wapń Ca 20 40 20 20 20 40u