Energy Levels and Bohr Model

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•Energy LevelsAtoms are made of three subatomic particles:__________, ____________, ___________

The ________ and _________ are located in the nucleus and the ________ are found in orbital shells.The electrons in the outer orbital shells are known as ________ _________. They are bond one atom to another.

Every atom has energy levels (also known as energy orbitals or valence shells) that hold the electrons.

•Energy Levels

Energy LevelMaximum Electrons in valence shell

Name of orbital

1

2

3

4

The ________ ________ states that atoms tend to combine in such a way that they each have eight electrons in their valence shells, giving them the same electronic configuration as a noble gas.

•Label the Energy Levels

• The ________ has an atom consisting of a small, positively-charged nucleus orbited by negatively-charged electrons.

•Bohr Model

•What are these elements?Given the three Bohr Models before, determine what element they are.

______________ _________________ ______________

Drawing Bohr Diagrams

•Bohr Diagrams

1) Find your element on the periodic table.2) Determine the number of electrons – it

is the same as the atomic number.3) This is how many electrons you will

draw.

•Bohr Diagrams

• Find out which period (row) your element is in.• Elements in the 1st period have one energy level.• Elements in the 2nd period have two energy levels, and so on.

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•Bohr Diagrams

C

1) Draw a nucleus with the element symbol inside.

2) Carbon is in the 2nd period, so it has two energy levels, or shells.

3) Draw the shells around the nucleus.

•Bohr Diagrams

1) Add the electrons.2) Carbon has 6

electrons.3) The first shell can

only hold 2 electrons.

C

•Bohr Diagrams

1) Since you have 2 electrons already drawn, you need to add 4 more.

2) These go in the 2nd shell.

3) Add one at a time -starting on the right side and going counter clock-wise.

C

•Bohr Diagrams

1) Check your work.2) You should have 6

total electrons for Carbon.

3) Only two electrons can fit in the 1st shell.

4) The 2nd shell can hold up to 8 electrons.

5) The 3rd shell can hold 18, but the elements in the first few periods only use 8 electrons.

C

•Bohr Diagrams

Try the following elements on your own:

a) Hb) Hec) Od) Ale) Nef) K

C

•Hydrogen Atom

Group: ______________ Period: ______________ Atomic # = # of electrons: _____________ Metal, Non-Metal, or Metalloid? ___________________

H

•Helium Atom

Group: ______________ Period: ______________ Atomic # = # of electrons: _____________ Metal, Non-Metal, or Metalloid? ___________________

He

•Oxygen Atom

Group: ______________ Period: ______________ Atomic # = # of electrons: _____________ Metal, Non-Metal, or Metalloid? ___________________

O

•Aluminum Atom

Group: ______________ Period: ______________ Atomic # = # of electrons: _____________ Metal, Non-Metal, or Metalloid? ___________________

Al

•Neon Atom

Group: ______________ Period: ______________ Atomic # = # of electrons: _____________ Metal, Non-Metal, or Metalloid? ___________________

Ne

•Potassium Atom

Group: ______________ Period: ______________ Atomic # = # of electrons: _____________ Metal, Non-Metal, or Metalloid? __________________

K

•Bohr Diagrams

Try the following elements on your own:

a) H – 1 electronb) Hec) Od) Ale) Nef) K

H

•Bohr Diagrams

Try the following elements on your own:

a) Hb) He - 2 electronsc) Od) Ale) Nef) K

He

•Bohr Diagrams

Try the following elements on your own:

a) Hb) Hec) O - 8 electronsd) Ale) Nef) K

O

•Bohr Diagrams

Try the following elements on your own:

a) Hb) Hec) Od) Al - 13 electronse) Nef) K

Al

•Bohr Diagrams

Try the following elements on your own:

a) Hb) Hec) Od) Ale) Ne - 10 electronsf) K

Ne

•Bohr Diagrams

Try the following elements on your own:

a) Hb) Hec) Od) Ale) Nef) K - 19

electrons

K

•Write in your Science Notebook.1. Find your _______________ on the periodic

table. 2. Determine the number of _______________ —

it is the same as the atomic number. 3. This is how many electrons you will

___________. 4. Find out which ______________________ your

element is in. This will tell you how many energy levels, or ______________ you will need to draw.

5. Draw your electrons in a __________clock-wise pattern, always starting on the ___________.

•Bohr Diagrams

Draw a Bohr Diagram for the first 20

elements.