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8th Grade Chemistry Atomic Stucture, Periodic Table, and Chemical equations
Transcript of 8th Grade Chemistry Atomic Stucture, Periodic Table, and Chemical equations
P - Protons and
E - Electrons
M - Mass subtracted
A - Atomic # equals
N - Neutrons 2MgSiO 4Fe + 3O 2Fe O Nucleus -Protons & Neutrons
Electron Cloud - Electrons Protons Neutrons Electrons Sub-Atomic Particles Location - Nucleus
Mass - Yes, aprox 1amu
Charge - Positive (+) Location - Nucleus
Mass - Yes, aprox 1amu
Charge - Neutral (no charge) Location - Electron Cloud
Mass - No, aprox .0001amu
Charge - Negative (-) Where is most of the mass located?
Electron Cloud Element Name Atomic #
# of Protons & Electrons Atomic Symbol Atomic Mass
Protons + Neutrons P =
N = Bohr Models 2 - 8 - 8 rule Valence Electrons - Electrons that are the furthest away from the nucleus or on the outer shell. Periods - How many energy levels (shells) are in each element. 1
4 Families or Groups
Show similar Chemical and Physical characteristics. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Reactivity Increases Reactivity Increases Whats more reactive? Lithium or Sodium? Which elements share similar physical and chemical characteristics? A. C, N, O
B. C, Si, P
C. F, Cl, Br Metals Solid
High melting/boiling point
Good conductors of electrcity Metaloids Share characteristics of both metals and non-metals. Non-Metals Dull
Low melting/boiling point
Poor conductor of electricity Which sub-atomic particles identifies the element on the Periodic Table?
C. Electrons What period is Na (sodium) in? A. Period 1
B. Period 2
C. Period 3 Which group is Be (Beryllium) in? A. 4
c. 1 What is the name of family/group 18? A. Noble Masses
B. Noble Gasses How many valence electrons does the elements in group 18 have? A. 8
B. 18 Do the elements in family 18 tend to react with other elements? Yes or No Valence Electrons determine the chemical properties of an element or how reactive it is. 1 Valence = Highly reactive (Alkali Family)
8 Valence = Least reactive (Noble Gasses) 4 Coefficient Tells you have many molecules you have.
Get multiplied into every element in that molecule. Subscript The small # below an element
Tells you how many atoms of that element Mg(SiO) How do we figure out how many atoms there are inside a parenthesis? 4 (Fe O) 3 4 Solve 3(Fe O) 3 4 2 2 3 Reactants Products How do you know a chemical reaction has taken place? Balanced vs. Unbalanced Zn + 2HCl ZnCl + H 2 2 4Fe + 3O 2Fe O 3 2 3 Which equation is balanced and follows the Law of Conservation of Mass? 1. 2. Density Formulas Match the model with the correct molecule A. 2NaCl
B. Na Cl
C. Na Cl Na Na Cl Cl 2 2 2 2 3 D=M/V Formula Units Volume: Ml or cm 3 Mass: g or kg Density: g/ml or g/cm 3 Definition - Practice If water has a density of 1g/ml Which item would float? Button Stick Penny Rubber Band Mass(g) Volume(ml) 5 .5 .25 1 2 5 .25 .1 18 18 22 The Atomic #, Atomic mass, Symbol and element name can be found on the?
c. Periodic Table Use Your Periodic Table to answer! Use Your Periodic Table to answer!