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Chemistry 1100A Notes .docx

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School
Western University
Department
Chemistry
Course
Chemistry 1027A/B
Professor
Prof Calin
Semester
Fall

Description
Topic A Atoms Molecules and MolesA1 Atoms AtomsBuilding blocks of all elements which contain 3 main components Proton Electron Neutron ProtonsPositive chargeFound in atoms nucleusHave almost same mass as neutron The mass is equal to one atomic mass unitMakes up most of the mass of the atom Electrons Negative charge Small and light Occupy the space around the nucleus Neutrons Neutral Found in atoms nucleus Almost same mass as ProtonsMake up most of the mass of the atom Atomic NumberThe number of protons in an atom Mass NumberTotal number of protons and neutrons in an atomMass Number Protons NeutronsXChemical sybol for the elementAMass Number ZAtomic Number IsotopesAtoms with the same number of protons but different numbers of neutronsSome elements have two isotopsEx Cl35 and Cl37
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