Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Atoms and Their Masses Unit 2, Activity 1 Active Chemistry: 1-3 Goals Students understand the following concepts atomic mass Students can use their Periodic Tables to identify Atomic Mass of different elements Do Now What is the difference between atomic number and atomic mass? Do Now What is the difference between atomic number and atomic mass? atomic number: the number of protons in an atom Atomic mass: the number of protons and the number of neutrons in an atom Objective I can define atomic mass and atomic number, and explain why atomic mass is different for every atom in the universe using independent practice Agenda 1. Do Now, Objective (5 min) 2. Video (10 min) 3. Atomic Mass Notes (15 min) 4. Guided Practice (5 min) 5. Independent Practice (20 min) 6. Quiz 3 Retake (10 min) The Power of Atoms http://www.youtube.com/watch?v=- 30Yn9_6hzg&edufilter=tbARfBHuyG 3mpAruEjLFww Quick Write – 5 min 1. What element is the amu (atomic mass unit) based on? 2. Describe ‘relative atomic mass’ Atomic Mass & Atomic Number Atomic Mass: the mass of an atom (# of protons + # of neutrons) Atomic Number: (# of protons) Atomic number also gives you the number of electrons in a NEUTRAL atom Charged atoms can have more/less electrons Atomic Mass Every element has a different atomic mass and atomic number because every element has a different number of protons The size of each element depends on the number of protons, neutrons, and electrons it has Hydrogen vs. Helium HYDROGEN Atomic Mass = 1 Atomic Number = 1 HELIUM Atomic Mass = 4 Atomic Number = 2 Atomic Mass & Atomic Number Magnesium Atomic Mass = 24 Atomic Number = 12 Atomic Mass = 63 Atomic Number = 29 Label your Key – Atomic Mass & Atomic Number How to Calculate the # of Particles Protons = Atomic # Electrons = Atomic # (if neutral atom) Neutrons = Atomic Mass – Atomic # Think Pair Share What is the atomic mass and atomic number of Carbon? Carbon Atomic Mass = 6+6 = 12 Atomic Number = 6 Think Pair Share Carbon How many protons does Carbon have? Think Pair Share How many electrons does Carbon have? Carbon 6 protons & 6 electrons Think Pair Share How many neutrons does Carbon have? Carbon # Neutrons = Atomic Mass – Atomic # # Neutrons = 12 – 6 = 6 And the Periodic Table… The Periodic Table increases by atomic number Atomic # Increases towards bottom right Atomic Mass Ratio Atomic Mass Ratio: the relative mass of one element when compared to another element (e.g. Boron: Hydrogen = 11:1) A boron atom is 11x heavier than a hydrogen atom Quick Write – 5 min Find the atomic mass ratio ___: ___ of the following pairs of elements – C:Li S:H Ne:Fe Cl:He Quick Write – 5 min Find the atomic mass ratio ___: ___ of the following pairs of elements – C:Li = 12:7 S:H = 32:1 Ne:Fe = 20:56 Cl:He = 35:4 Independent Practice – 20 min Complete the Independent Practice with a partner Trade & Grade – Atomic Structure Worksheet a) b) c) 1 Proton (+1) Neutron (no charge) Electron (-1) The number of protons in one atom an element determines the atom’s atomic #, and the number of electrons determines the charge of an element Trade & Grade – Atomic Structure Worksheet a) The atomic number tells you the number of protons in one an atom of an element. It also tells you the number of electrons in a neutral atom of that element. The atomic number gives the identity of an element as well as its location on the periodic table. No two different elements will have the same atomic number Trade & Grade – Atomic Structure Worksheet a) The atomic mass of an element is the total number of protons and neutrons in the nucleus of the atom b) The atomic mass of an element is the total number of protons and neutrons in the nucleus of the atom Trade & Grade – Atomic Structure Worksheet a) The atomic mass is used to calculate the number of neutrons in one atom of an element. In order to calculate the number of neutrons you must subtract the atomic # from the atomic mass Quiz 3 Retake Silently complete your quiz at your desk use a calculator (not phones)