How to Draw Bohr Diagrams Lewis Structures 8

How to Draw Bohr Diagrams & Lewis Structures 8 p 8 n

Drawing Bohr Models 1. Draw the nucleus. 2. Write the number of neutrons and the number of protons in the nucleus. 3. Draw the first energy level. 4. Draw the electrons in the energy levels. 5. Remember the rules for electron levels: • Level 1 – holds a max of 2 electrons • Level 2 – holds a max of 8 electrons • Level 3 – holds a max of 8 electrons (for now )

Guided Practice Determine the number of protons, neutrons, and electrons. Once you have found this information, follow the directions to draw your model. Protons: _____ Neutrons: _____ 8 Electrons: ______ 8 8 How many energy shells will this have? ____ 2 How many valence (outer) electrons does this element have? ____ 6 Bohr Model:

Lewis Structures Rules 1) Find your element on the periodic table. 2) Determine the number of valence electrons. 3) This is how many electrons you will draw around the symbol for that element.

Counting Valence Electrons Carbon Oxygen Beryllium 4 valence electrons 6 valence electrons 2 valence electrons

Drawing Lewis Structures • a way of drawing the outer energy level electrons (valence) of an atom • The symbol for the element surrounded by as many dots as there are electrons in its outer energy level (valence) • Examples How many valence electrons do each of these atoms have?

Lewis Structures C 1) Write the element symbol. 2) Carbon has 4 valence electrons. 3) Starting at the right, draw 4 electrons, or dots, counterclockwise around the element symbol.

Lewis Structures C 1) Check your work. 2) Using your periodic table, check that Carbon is in the 4 th group. 3) You should have 4 total electrons, or dots, drawn in for Carbon.

Lewis Structures C On your worksheet, try these elements on your own: a) H b) P c) Ca d) Ar e) Cl f) Al

Lewis Structures On your worksheet, try these elements on your own: H a) b) c) d) e) f) H P Ca Ar Cl Al

Lewis Structures On your worksheet, try these elements on your own: P a) b) c) d) e) f) H P Ca Ar Cl Al

Lewis Structures On your worksheet, try these elements on your own: Ca a) b) c) d) e) f) H P Ca Ar Cl Al

Lewis Structures On your worksheet, try these elements on your own: Ar a) b) c) d) e) f) H P Ca Ar Cl Al

Lewis Structures On your worksheet, try these elements on your own: Cl a) b) c) d) e) f) H P Ca Ar Cl Al

Lewis Structures On your worksheet, try these elements on your own: Al a) b) c) d) e) f) H P Ca Ar Cl Al

PRACTICE Complete the Lewis Structure Worksheet & it is due by the end of the hour.