APEMAN – Determining # of Subatomic Particles

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?

APE MAN • Note: • We can NEVER assume the number of NEUTRONSin 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’sIDENTITY. • 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 • 6 • 6 • 12 • 6 • 6

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 • 7 • 7 • 14 • 7 • 7

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 • A = 20 • N = 20

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

APE MAN Chlorine…please! • A = 17 • P = 17 • E = 17 • M = 35 • A = 17 • N = 18

APE MAN: Neon • A 10 • P 10 • E 10 • M 20 • A 10 • 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 

APEMAN – Determining # of Subatomic Particles