12.1 Atomic Structure

Subatomic Particles Subatomic particles are particles that are inside the atom. proton neutron electron

Protons positive charge located in the nucleus (center of the atom) accounts for some of the mass of an atom always the same for atoms of the same element

Protons # of protons = atomic number

Check in: How many protons are in the atoms of the following elements? Al Do the number of protons in an atom ever change?

Neutrons neutral charge located in the nucleus account for the mass of an atom

Electrons negative charge located in the electron cloud account for the volume of the atom

Comparing Particles protons and neutrons are MASSIVE compared to electrons electrons mass is so small we tend to ignore it to determine the mass of an atom (mass number) mass # = protons + neutrons

Atomic Forces REVIEW: opposites attract likes repel Protons and Electrons: opposite charges – attract attraction holds electrons onto the outside of the atom

Check-in: If an atom of oxygen has 8 protons and 7 neutrons, what is its mass? If an atom of chlorine has a mass number of 36, how many neutrons does it have?

Good Morning! Take out a notebook Take out your lab notebook Back page has periodic table! Take out your homework packet Begin working on HW packet pg. 3-4

Tuesday, February 24, 2015 Learning Target: I can identify subatomic particles and their properties in an atom Today: Review Subatomic particles Review Exit Question Isotopes, Ions, and more! Coming up: Quiz Thursday (atomic structure) HW Packet pages 2-4 due Thurs

Review of Subatomic Particles Protons – positive, in the nucleus, massive Neutrons – neutral, in the nucleus, massive Electrons – negative, outside nucleus, very tiny mass, take up space Atomic # = # protons Mass # = # protons + # neutrons

Exit Question PP N How many protons? 2 What element? Helium (He) How many neutrons? 1 How many electrons (if neutral)?** 2 (same as P)

Atomic Forces Think: If like repel, then why are the protons together in the nucleus? The strong force holds protons together in the nucleus.

VIDEO: Just How Small is the Atom??? http://ed.ted.com/lessons/just-how-small-is-an-atom#watch

Varying Subatomic Particles PROTONS NEVER CHANGE FOR ATOMS OF THE SAME ELEMENT! electrons and neutrons, however, CAN change

Isotopes Isotopes are atoms of the same element that have different number of neutrons. If the number of neutrons change, the mass of the atom changes mass # = protons + neutrons

Ions ions are atoms that have a charge atoms lose or gain electrons to change the overall charge of the atom

Review Groups Tara, Cole C, Chris, Avery - Station 1 Maddie, Jean, Ayrias - Station 3 Eli, Sam, Brianna, Herlinda - Station 5 Juan, Anna, Devon, Gilberto - Station 7 Lysandra, Mandy, Amanda - Station 9 Mohamed, Lizzy, Randy - Station 11 Jackie, Jazz, Andre - Station 13 Dylan, Tas, Kalie - Desks Cole F, David, Zach - Desks

Good Morning! Take out your notes from yesterday Turn in your Lab 12a half sheet Take out your Lab Notebook Turn to page 82

Wednesday, February 25, 2015 Learning Target: I can describe the structure of an atom Today: Review Isotopes and Ions (5 min) Atom building game (30 min) Work time on homework packet (rest)