WELCOME!! 1.Please be in your seats by the time the bell rings. 2.On your catalyst sheet you should be on October 27 th.

Your atomic # is 10. What is your number of protons and electrons. Now you have a mass # of 13, what is your number of neutrons? 5 MINUTES CATALYST

4 MINUTES CATALYST You atomic # is 10. What is your number of protons and electrons. Now you have a mass # of 13, what is your number of neutrons?

You atomic # is 10. What is your number of protons and electrons. Now you have a mass # of 13, what is your number of neutrons? 3 MINUTES CATALYST

Your atomic # is 10. What is your number of protons and electrons. Now if your mass number is 13. What is your number of neutrons? 2 MINUTES

CATALYST Your atomic # is 10. What is your number of protons and electrons. Now if your mass number is 13. What is your number of neutrons? 1 MINUTE

TIME’S UP!!!!!

Catalyst Answer You atomic # is 10. What is your number of protons and electrons. 10 Now you have a mass # of 13, what is your number of neutrons? 3

AGENDA Catalyst Notes over Electron Levels Bohr Model practice

ANNOUNCEMENTS 1.See me for help. 2.Quizzes to be taken Friday if not taken. 3.Chemical science Halloween demos on Friday

TODAY’S OBJECTIVE Today you will be introduced to electron orbit levels and practice with the Bohr model diagram. HS-PS1-2: Create knowledge of reaction based on patterns of properties

How are atoms drawn? Electron Diagrams!!!! Nucleus is still located in the center Electrons are placed in their orbitals Note the pattern at which electrons are filled in each orbital: First orbital holds TWO electrons Second orbital holds EIGHT electrons Third orbital holds EIGHT electrons

Drawing the diagram: Example: Draw electron diagram for carbon: 6 protons, 6 neutrons, 6 electrons Step 1: Find the number of electrons – According to our example, how many electrons does carbon have? – 6!! P- 6 N-6 Nucleus

Drawing the diagram Example: Draw electron diagram for carbon: 6 protons, 6 neutrons, 6 electrons Step 2: Draw first electron orbital around nucleus. – How many electrons does it hold? – 2!! P- 6 N-6

Draw the diagram Example: Draw electron diagram for carbon: 6 protons, 6 neutrons, 6 electrons Step 3: If more electrons need to be filled, draw another electron shell. – How many electrons does the second shell hold? – 4!! – How many electrons do we have left over? – 0!! P- 6 N-6

Example Argon: 18 protons, 22 neutrons, 18 electrons

Example Helium: 2 protons, 2 neutrons, 2 electrons

Example: Oxygen: 8 protons, 8 neutrons, 8 electrons

Example: Aluminum: 13 protons, 13 neutrons, 13 electrons