Drawing Bohr Models and Lewis Dot Structures

Bohring

Bohr Models Used to predict reactivity in elements Reactivity - how likely an element is to form a compound with another element, based on valence electrons

Drawing Bohr Models Draw the nucleus.

Drawing Bohr Models Draw the nucleus. Write the number of Protons and Neutrons in the nucleus P:9 N:10

Drawing Bohr Models Draw the first shell P:9 N:10

Drawing Bohr Models Draw the first shell Add the electrons, the first shell can only hold 2 P:9 N:10

Drawing Bohr Models Draw the next shell if you have more electrons to add P:9 N:10

Drawing Bohr Models Add your electrons, the 2nd shell can hold up to 8 Be sure to add them one at a time going clock wise. P:9 N:10

Rules for Energy Levels Keep adding shells until you use up all of your electrons. Here is how many each shell holds: Shell 1: 2 Shell 2: 8 Shell 3: 18 Shell 4: 32

Guided Practice It is easiest to figure out your protons, neutrons and electrons and then draw. 6 6 6 6 C Carbon 12.011 Protons: _____ Neutrons: _____ Electrons: ______ How many energy shells will this have? ____ How many valence (outer) electrons does this element have? ____ Bohr Model: 2 4

Guided Practice 16 S Sulfur 32.066 16 16 16 Protons: _____ Neutrons: _____ Electrons: ______ How many energy shells will this have? ____ How many valence (outer) electrons does this element have? ____ Bohr Model: 3 6

Guided Practice Protons: _____ Neutrons: _____ Electrons: ______ 3 Li Lithium 6.941 Protons: _____ Neutrons: _____ Electrons: ______ How many energy shells will this have? ____ How many valence (outer) electrons does this element have? ____ Bohr Model: 3 4 3 2 1

Guided Practice 10 10 10 10 Ne Neon 20.180 Protons: _____ Neutrons: _____ Electrons: ______ How many energy shells will this have? ____ How many valence (outer) electrons does this element have? ____ Bohr Model: 2 8

Guided Practice 15 16 15 15 P Phosphorus 30.974 Protons: _____ Neutrons: _____ Electrons: ______ How many energy shells will this have? ____ How many valence (outer) electrons does this element have? ____ Bohr Model: 3 5

Guided Practice 11 12 11 11 Na Sodium 22.990 Protons: _____ Neutrons: _____ Electrons: ______ How many energy shells will this have? ____ How many valence (outer) electrons does this element have? ____ Bohr Model: 3 1

Drawing Lewis Dot Structures Lewis Dot Structures are easier, all you need are the number of valence electrons. Fluorine has 7 valence electrons

Drawing Lewis Dot Structures Write the letter(s) for the element to represent the nucleus. Draw the valence electrons around the letter. Two electrons will fit around each side for a total of 8. Draw four all the way around the letter before drawing a second one. F

Drawing Lewis Dot Structures DONE!! Add the valence electrons in the same way as Bohr models, go clockwise F

Guided Practice 6 Number of Valence Electrons: _____

Guided Practice 5 Number of Valence Electrons: _____

Guided Practice 1 Number of Valence Electrons: _____