2 hydrogen atoms; 3 helium atoms; 5 oxygen atoms; 6 iron atoms 19 aluminum atoms; 15 phosphorus atoms; 7 sodium atoms B. What do the following spellings indicate: 4Cl; 12 thousand; 17Zn; 2 grams; Three;

2 hydrogen atoms; 3 helium atoms; 5 oxygen atoms; 6 iron atoms

19 aluminum atoms; 15 phosphorus atoms; 7 sodium atoms
B. What do the following spellings indicate:
4Cl; 12 thousand; 17Zn; 2 grams; Three; 8C; 15Al

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