Presentation on theme: "I. Structure of the Atom Dalton’s Atomic Theory Subatomic Particles"— Presentation transcript:
1 I. Structure of the Atom Dalton’s Atomic Theory Subatomic Particles Ch. 4 - Atomic StructureI. Structure of the AtomDalton’s Atomic TheorySubatomic Particles
2 A. Dalton’s Atomic Theory Every element is made of tiny, unique, particles called atoms that cannot be subdivided.Atoms of the same element are exactly alike.Atoms of different elements can join to form molecules.
3 B. Subatomic Particles in a neutral atom Atomic Number NUCLEUSELECTRONSin a neutral atomPROTONSNEUTRONSNEGATIVE CHARGEPOSITIVE CHARGENEUTRAL CHARGEMost of the atom’s mass.Atomic Numberequals the # of...
4 Atomic Number = # of Protons & Electrons Atomic Mass = # of Protons B. Subatomic ParticlesElement Symbol10Atomic Number = # of Protons & ElectronsNeElement NameNeonAtomic Mass = # of Protons+# of Neutrons20.179
5 B. Subatomic ParticlesAtoms have no overall charge because the protons (+) cancel out the electrons (-).Neon10 protons = +1010 neutrons = 010 electrons = -10total charge 0
6 II. Electron Cloud Model Orbital Energy Levels Bohr Model Diagrams Ch. 4 - Atomic StructureII. Electron Cloud ModelOrbitalEnergy LevelsBohr Model Diagrams
7 B. Energy Levels Electrons can only exist at certain energy levels. Low energy levels are close to the nucleus.Each energy level (n) can hold a certain number of electrons.
8 A. OrbitalRegion where there is 90% probability of finding an electron.Can’t pinpoint the location of an electron.Density of dots represents the probability.
9 C. Bohr Model DiagramsSimplified energy levels using Bohr’s idea of circular orbits.Can replace with:3p4nLithiumAtomic #: 3Mass:# of p: 3# of e: 3# of n: 4e-e-pnMaximum e-Level 1 2e-Level 2 8e-Level 3 18e-Level 4 32e-e-
10 C. Bohr Model Activity Choose a number between 1 & 18. Find your element by the atomic number you picked.Draw a Bohr Model diagram for your element on your marker board.Round off the atomic mass listed on the table and subtract the atomic # to find the # of neutrons.Abbreviate the # of ‘p’ and ‘n’ in the nucleus.Have a partner check your drawing.Repeat with a new element.
11 III. Masses of Atoms Atomic Mass Mass Number Isotopes Ch. 4 - Atomic StructureIII. Masses of AtomsAtomic MassMass NumberIsotopes