Chemistry 0.0 / 5 ? ChemistryAtoms and compoundsIGCSEEdexcel Created by: xanjk26xCreated on: 07-09-14 14:51 Chemical symbol for Potassium Ca 1 of 13 Define an Element An element is a substance that is made entirely from one type of atom. 2 of 13 What is a molecule? When atoms join together, the group of combined atoms is a molecule. 3 of 13 Define a mixture Mixtures are made up of at least two or more substances together that have not been chemically bonded. 4 of 13 What is the charge of a proton? +1 5 of 13 What is the mass of an electron? 1/2000 6 of 13 Atomic number- Number of protons in an atom 7 of 13 Mass number- Sum of the Protons and neutrons 8 of 13 RAM= (% of A x mass number A) + (% of B x mass number B) /100 9 of 13 Correct Electron configuration 2,8,8 10 of 13 Formula of sodium sulphate: Na2SO4 11 of 13 Period number= Number of electron shells 12 of 13 Group number= Number of outer electron shells 13 of 13
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