Presentation on theme: "Atomic Structure and the Periodic Table"— Presentation transcript:
1 Atomic Structure and the Periodic Table Chapter 10 Notes
2 Chemical SymbolsChemical symbol – an abbreviated way to write the name of an element. -example: Carbon – C Proton – positively charged particle found in the nucleus of an atom. Neutron – neutrally charged particle found in the nucleus of an atom. Atomic number – the number of protons in the nucleus of an atom.
3 The Electron CloudElectron cloud – cloud that surrounds the nucleus of an atom that describes the region in which an electron is most likely to be.Example: students in a school
4 Energy LevelsYou can represent the energy differences of the electrons by picturing the atom as having different energy levels.Example: shelves of a refrigerator door (table 10-3)
5 Masses of AtomsMass number = the sum of the number of protons and the number of neutrons in the nucleus of an atom.Number of neutrons = mass number – number of protons.
6 IsotopesAtoms of the same element that have different numbers of neutrons.See table 10-4 on pg. 279
7 Average atomic massAverage atomic mass = the average mass of the mixture of an element’s isotopes.Example: boron-11