Chemistry 2 0.0 / 5 ? ChemistryAtomsGCSEWJEC Created by: Victoria.1Created on: 12-05-16 11:34 Mass Number Total number of protons and electrons. 1 of 11 Proton Atomic Number of protons in the nucleus 2 of 11 Note The number of protons is equal the the number of elcetrons 3 of 11 Isotope Atoms which have the same number of protns with the number of electrons 4 of 11 Number Of Neutrons Mass number - the atomic number 5 of 11 Peridodic Table Group- Number of electrons in the outer shell, Period- number of shel;ls an atom has. 6 of 11 Electronic Structure 1st shell= 2 electrons, 2nd shell=8 electrons, 3rd shell=8 electrons 7 of 11 E.g nitogen has 7 electrons so the structure would be 2,5. aluminuim has 13 electrons so its structure would be 2,8,3 8 of 11 Ar Mass of an atom always given 9 of 11 Mr sum of masses of an induvidual atom 10 of 11 E.g Ar(H)=1 Ar (O)=16, Mr(2*H)+(1*O)=18 11 of 11
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