There are 3 different puzzles using the same clues to 41 elements. The clues are atomic number and symbol. The teacher can use them
on different days, same day different classes, all in each class to prevent cheating or as make up work for absentees on the day the puzzle was used in class.
There are many nature study and science games in my TPT store -- Word Search, Crosswords, Anagrams, Bingo, Rummy, Concentration, Tic Tac Know, Sorting, Dominoes and Board games.