Chemistry 0.0 / 5 ? ChemistryAtoms and compoundsGCSEAQA Created by: ibrahimr967Created on: 29-11-17 19:13 How many elements exist ? About 100 1 of 5 How many compounds exist ? Over 1000 2 of 5 what is information is given by the mass number and the atomic number ? Atomic Number.Number of protons / Mass Number. Number of protons plus electrons 3 of 5 Biology Human 4 of 5 Physics E 5 of 5
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