Atoms Journal 41) Copy the standards (page 118) 8.3. with a with a. b. and c. Class discussion will follow: think about what you already know about atoms and the periodic table Journal 41) Copy the standards (page 118) 8.3. with a with a. b. and c. Class discussion will follow: think about what you already know about atoms and the periodic table

Grade: Its a Gas Lab Hypothesis (4 pts) Charts completed (16 pts) Questions (10 pts) Conclusion (5 pts) Total (35 pts) (2 bonus pts for typed) Hypothesis (4 pts) Charts completed (16 pts) Questions (10 pts) Conclusion (5 pts) Total (35 pts) (2 bonus pts for typed)

Review questions (Everyone at the table should know the answer!) Groups of 2 or more atoms held together by chemical bonds are (elements, molecules, particles, or electrons) When elements are chemically combined in a set ratio they form (molecules, matter, elements, or compounds) Groups of 2 or more atoms held together by chemical bonds are (elements, molecules, particles, or electrons) When elements are chemically combined in a set ratio they form (molecules, matter, elements, or compounds)

Review questions Which of the following is an example of an element? (copper, rust, concrete, water) 2 compounds with different properties are C and O H and O CO and CO 2 Cl and Ar Which of the following is an example of an element? (copper, rust, concrete, water) 2 compounds with different properties are C and O H and O CO and CO 2 Cl and Ar

Atomic Theory Copy underlined names on the left side of your page Democritus (Greek philosopher: matter made of small pieces called atomos - uncuttable) Copy underlined names on the left side of your page Democritus (Greek philosopher: matter made of small pieces called atomos - uncuttable)

Dalton (English chemist)

Thomson (English scientist) Atoms have negative charged electrons on the outside of positive charged sphere Thomson (English scientist) Atoms have negative charged electrons on the outside of positive charged sphere

Rutherford (experiments lead him to believe atoms are mostly empty space with a positively charged nucleus) If the nucleus was the size of a dime, how far away would the atoms edge be? 1)Make a prediction Rutherford (experiments lead him to believe atoms are mostly empty space with a positively charged nucleus) If the nucleus was the size of a dime, how far away would the atoms edge be? 1)Make a prediction

The diameter of an atom can be 100,000 times the size of the nucleus. 1) Measure the diameter of a dime in millimeters 2) Multiple by 100,000 3) Change units to meters by dividing by 1,000 4) Change units to kilometers by dividing by 1,000 5) Multiply by 0.6 to get miles How Far Away?

How Big is it? Make the smallest dot possible on your page It represents a speck of dust How many atoms can fit in your speck of dust? There are about 1 million billion atoms in a speck of dust! 1,000,000 X 1,000,000,000 Thats 1,000,000,000,000,000 atoms

Modern Atomic model

Copy the key terms on left side of page 1) Atom2) Nucleus3) Proton 4) Neutron5) Electron6) Energy Level 7) Atomic number8) Isotope9) Mass number

Definitions: 1) The basic particle from which all elements are made 2) Center core of an atom 3) Positively charged particle in nucleus 4) Particle in nucleus with no electric charge 5) Negatively charged particle outside of nucleus 1) The basic particle from which all elements are made 2) Center core of an atom 3) Positively charged particle in nucleus 4) Particle in nucleus with no electric charge 5) Negatively charged particle outside of nucleus

6) Electrons energy, related to distance from nucleus (shell / orbit / cloud) 7) Number of protons in atom (number on periodic table) 8) Atoms of same element with different numbers of neutrons 9) Sum of the protons and neutrons in the atoms nucleus 6) Electrons energy, related to distance from nucleus (shell / orbit / cloud) 7) Number of protons in atom (number on periodic table) 8) Atoms of same element with different numbers of neutrons 9) Sum of the protons and neutrons in the atoms nucleus

Draw Lithium atom Label all parts, use at least half the page Atomic number = 3 Mass number = 7 Nucleus (protons and neutrons) Electrons (2 in first energy level and 1 in second energy level) Electrical charges Label all parts, use at least half the page Atomic number = 3 Mass number = 7 Nucleus (protons and neutrons) Electrons (2 in first energy level and 1 in second energy level) Electrical charges