Bohr Diagrams :Bohr Diagrams 1 M.Bregar (Dante C.S.S.)


The Atom :The Atom Smallest particles of matter, everything is made out of atoms Atoms are made of subatomic particles: 2 M.Bregar (Dante C.S.S.)


Atomic Structure(see handout – Atomic Structure & Periodic Table ) :Atomic Structure(see handout – Atomic Structure & Periodic Table ) PROTONS & NEUTRONS Found in the nucleus Both have mass Protons carry an electrical charge ELECTRONS: Have negligible mass Carry an electrical charge Orbit the nucleus within electron shells NUCLEUS PROTONS NEUTRONS ELECTRONS Electron Shells 3 M.Bregar (Dante C.S.S.)


Atomic Structure :Atomic Structure Properties of Subatomic Particles 4 M.Bregar (Dante C.S.S.)


Reviewing Atomic Structure :Reviewing Atomic Structure 5 M.Bregar (Dante C.S.S.)


Bohr Diagrams :Bohr Diagrams A method of drawing atoms Based on “planetary model” of solar system Electrons circle nucleus in orbits (electron shells) You draw atoms based on the information provided by the periodic table 6 M.Bregar (Dante C.S.S.)


Orbits in Bohr Diagrams :Orbits in Bohr Diagrams Orbits or Energy Levels in Bohr Diagrams can hold a maximum number of electrons 7 M.Bregar (Dante C.S.S.)


Orbits in Bohr Diagrams :Orbits in Bohr Diagrams A electron shell / orbit is simply the area in which you find electrons Once you fill a shell you move to the next shell 8 M.Bregar (Dante C.S.S.)


Bohr Diagrams :Bohr Diagrams 9 M.Bregar (Dante C.S.S.)


A Real Atom :A Real Atom 10 M.Bregar (Dante C.S.S.)


Bohr Diagram of Helium :Bohr Diagram of Helium 11 M.Bregar (Dante C.S.S.)


Bohr Diagrams :Bohr Diagrams Now lets look at the steps to draw a Bohr diagram...... 12 M.Bregar (Dante C.S.S.)


Slide 13:13 M.Bregar (Dante C.S.S.)


Examples :Examples Lets complete examples of Bohr Diagrams for Carbon Fluorine Neon Magnesium 14 M.Bregar (Dante C.S.S.)


Ex. 1 - Carbon :Ex. 1) How many protons, neutrons and electrons are found in Carbon? C ATOMIC NUMBER # of Protons = # of Electrons Carbon has 6 protons Carbon has 6 electrons ATOMIC MASS __ Protons + __ Neutrons = 12 6 6 Ex. 1 - Carbon M.Bregar (Dante C.S.S.) 15


Ex. 1 - Carbon :Ex. 1 - Carbon M.Bregar (Dante C.S.S.) 16


Ex. 2 - Fluorine :Ex. 2) How many protons, neutrons and electrons are found in Fluorine? F ATOMIC NUMBER # of Protons = # of Electrons Fluorine has 9 protons Fluorine has 9 electrons ATOMIC MASS __ Protons + __ Neutrons = 19 10 9 Ex. 2 - Fluorine M.Bregar (Dante C.S.S.) 17


Ex. 2 - Fluorine :Ex. 2 - Fluorine M.Bregar (Dante C.S.S.) 18


Ex. 3 - Neon :Ex. 3) How many protons, neutrons and electrons are found in Neon? Ne ATOMIC NUMBER # of Protons = # of Electrons Neon has 10 protons Neon has 10 electrons ATOMIC MASS __ Protons + __ Neutrons = 20 10 10 Ex. 3 - Neon M.Bregar (Dante C.S.S.) 19


Ex. 3 - Neon :Ex. 3 - Neon M.Bregar (Dante C.S.S.) 20


Ex. 4 - Magnesium :Ex. 3) How many protons, neutrons and electrons are found in Magnesium? Mg ATOMIC NUMBER # of Protons = # of Electrons Magnesium has 12 protons Magnesium has 12 electrons ATOMIC MASS __ Protons + __ Neutrons = 24 12 12 Ex. 4 - Magnesium M.Bregar (Dante C.S.S.) 21


Ex. 4 - Magnesium :Ex. 4 - Magnesium M.Bregar (Dante C.S.S.) 22