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Changes Matter Unit 2, Day 25 10/29/14 Period 1 Period 4 Period 5 Period 6 Changes Matter WEEK 9 10/29/14 CATALYST What do you think an atom is? Have out on your desk: Binder Notes *Answer in complete sentences! Homework: None! (front) TURN IN write-ups if you didn’t yesterday 0:01 0:02 0:03 0:04 0:05 0:06 0:07 0:08 0:09 0:10 0:11 0:12 0:13 0:14 0:15 0:16 0:17 0:18 0:19 0:20 0:21 0:22 0:23 0:24 0:25 0:26 0:27 0:28 0:29 0:30 0:31 0:32 0:33 0:34 0:35 0:36 0:37 0:38 0:39 0:40 0:41 0:42 0:43 0:44 0:45 0:46 0:47 0:48 0:49 0:50 0:51 0:52 0:53 0:54 0:55 0:56 0:57 0:58 0:59 1:00 1:01 1:02 1:03 1:04 1:05 1:06 1:07 1:08 1:09 1:10 1:11 1:12 1:13 1:14 1:15 1:16 1:17 1:18 1:19 1:20 1:21 1:22 1:23 1:24 1:25 1:26 1:27 1:28 1:29 1:30 1:31 1:32 1:33 1:34 1:35 1:36 1:37 1:38 1:39 1:40 1:41 1:42 1:43 1:44 1:45 1:46 1:47 1:48 1:49 1:50 1:51 1:52 1:53 1:54 1:55 1:56 1:57 1:58 1:59 2:00 End Changes Matter 10/29/14 Learning Intention: We will demonstrate knowledge of the elements that compose the periodic table. Success Criteria: We will be successful when we can calculate the number of electrons, protons, and neutrons an element has based on the atomic number & mass number. Today’s Agenda Turn in write-ups Intro to Unit 3: The Atom Notes Review Clip (if done early) NEW Unit = THE ATOM AKA TAKE the building blocks of matter OUT UNIT 3 NOTES! Lets be COLLEGIATE Remember… Elements are: _________________________________________ __________________________________________ The Atom Although elements are the purest form of anything, they can be broken down into their smallest form: the atom Everything that is a pure element is made of the exact same atoms. The Atom Each atom is made of 3 parts: the proton, the neutron and the electron Proton: subatomic particle that is found in the nucleus that carries a positive charge, and has a mass of 1 amu (AMU = Atomic Mass Units) The Atom Each atom is made of 3 parts: the proton, the neutron and the electron Neutron: subatomic particle found in the nucleus that has no charge and a mass of 1 amu The Atom Each atom is made of 3 parts: the proton, the neutron and the electron Electron: subatomic particle found flying around the nucleus that carries a negative charge All atoms have the same general structure The protons and neutrons are found in the center, or the nucleus Electrons surround the nucleus in orbitals We identify each element by how many protons it has …This is the atomic number Each element has a unique atomic number This number increases as you move from left to right on the periodic table In order for an element to not carry a charge, the number of protons and the number of electrons must be exactly the same. Example: The atomic number of carbon is 6. How many protons and electrons does it have? Atomic number = Number of protons = Number electrons 6=6=6 → 6 protons & 6 electrons Practice: Determine the number of protons and electrons each of the following elements has. 1. Br 2. Xe 3. Sb 4. H Practice: Determine the number of protons and electrons each of the following elements has. 1. Br 35 protons, 35 electrons 2. Xe 54 protons, 54 electrons 3. Sb 51 protons, 51 electrons 4. H 1 proton, 1 electron Each individual atom has a mass, measured in atomic mass units amu is used because the mass of each subatomic particle is too small to measure in grams The mass of each atom is equal to the number of protons plus the number of neutrons. (Electrons are ignored, because their mass is so small that they don’t affect the mass enough) Example: Determine how many protons, neutrons and electrons helium has. 1. Find the chemical symbol 1. Identify the atomic number (# protons) 2. Identify the atomic mass 3. Take atomic mass – atomic number to find number of neutrons 4. Round to nearest whole number Practice: Complete the table. Element Name Element Symbol Carbon Atomic Mass 12.01 N Protons 6 7 17 Xe Potassium Neutrons 7 Electrons Practice: Complete the table. Element Name Carbon Nitrogen Element Symbol C N Atomic Mass 12.01 Protons Neutrons 6 6 7 7 17 Xe Potassium Electrons 6 Using your periodic table, what element has 8 neutrons and an atomic mass of 16? *Complete Sentences! Have a good day Success Criteria Question Changes Matter 10/29/14