APEMAN – Determining # of Subatomic Particles Ms. Millimet August 15, 2013

Entrance Procedure Walk in classroom silently Pick up papers that you need from side table then walk to your seat (Keep walking forward, do not turn around) Check board and Sit down at your desk. Write down homework in your planner. Take out have-outs: Study Buddy Binder and Periodic Table Start DO First 5 minutes to work on do first, silently and independently

Objective SWBAT determine the number of subatomic particles for a neutral atom using the periodic table. WHY? Allows us to determine the differences between atoms and elements. This is why materials look and act differently! Tomorrow, we are drawing models of atoms, called Bohr Models! Reach our growth goal and pass/earn commended on STAAR (This is all over it!)

Quick Reminder: At which of the following locations in an atom would you find a neutron? a. Orbiting the nucleus b. Orbiting an electron c. Inside the nucleus d. Inside a proton Which of the following is found farthest from the center of an atom? a. Nucleus b. Proton c. Neutron d. Electron

Atomic Structure Each element or type of atom has a different number of protons, neutrons and electrons, giving them different properties. We can use the PERIODIC TABLE to figure out how many subatomic particles an element will have. We know the atomic number tells us how many protons we have… But how do we know how many electrons or neutrons are in each atom?

Step 1: Look at the Periodic Table Square 1st letter capital 2nd lower case Number of protons. Tells you what kind of atom it is. Protons + neutrons (round to the nearest whole number) What can we deduce or infer from this information so we can learn more about the element?

Look at the MASS NUMBER/ ATOMIC MASS MASS number/ ATOMIC MASS = Protons + Neutrons in atom Decimal but, always round to the nearest whole number Why don’t we include the number of electrons? ATOMIC MASS

Check Yourself! What element has 47 protons? What is the Atomic Mass for Sodium? (*don’t forget to round to the nearest whole number!) What is the Atomic Mass for Chlorine? How many protons does Silicon have? What element has 29 electrons?

-Atomic number APE MAN Atomic number Protons Electrons Mass number Note: We can NEVER assume the number of NEUTRONS in an atom! In a NEUTRAL or STABLE atom, the number of electrons always equals the number of PROTONS. The atomic number ONLY tells us the # of PROTONS and the atom’s IDENTITY. A NEUTRAL atom has a charge of ZERO. (Protons and Electrons cancel out!) Atomic number Protons Electrons Mass number -Atomic number Neutrons

Complete an APE MAN for Carbon How many neutrons are in an atom of carbon? Atomic number Protons Electrons Mass number -Atomic number Neutrons 6 12

Use APE MAN to figure out the number of neutrons How many neutrons are in an atom of nitrogen? Atomic number Protons Electrons Mass number -Atomic number Neutrons 7 14

Now you Try! Let’s say an element has a atomic mass of 40 and an atomic number of 20. Complete APE-MAN to learn as much as you can about this element! A = 20 P = 20 E = 20 M = 40 N = 20

APE MAN for Fluorine! A = 9 P = 9 E = 9 M = 19 N = 10

APE MAN Chlorine…please!

APE MAN: Neon A 10 P 10 E 10 M 20 N 10

Stretch! An electrically neutral atom consists of 14 neutrons, 13 electrons, and a number of protons. What is its atomic mass? a. 13 b. 15 c. 27 d. 30 What element is it? Aluminum

Practice and Exit Ticket Complete the APEMAN Practice worksheet independently at Level 1 (whisper) Finish what you do not complete in class for Homework Exit ticket with 8 minutes left Put notes in Study Buddy Binder Take out Red Pen to Trade and Grade Keep out Periodic Table for Exit Ticket 