How do you use the periodic table to: › Determine # of protons › Determine # of neutrons ›...
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Transcript of How do you use the periodic table to: › Determine # of protons › Determine # of neutrons ›...
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Table Talk…Review from last class
How do you use the periodic table to:› Determine # of protons› Determine # of neutrons› Determine # of electrons› Determine # of energy levels› Determine # of valence electrons› Determine probable charge elements will
acquire to be stable?› Find metals or nonmetals?
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Metals vs. Nonmetals
Which of the following samples would you characterize as metal or nonmetal?
Be prepared to justify your answers Samples will be projected on the doc
cam
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Metals vs. Nonmetals
Metals are:› Hard and shiny› 3 or less valence
electrons› Form cations by
losing electrons› Good conductors of
electricity
Nonmetals are:› Gases or dull,
brittle solids› 5 or more valence
electrons› Form anions by
gaining electrons› Poor conductors of
electricity
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Heavy Metal Lab(fill in the column headings)
1. Describe sample (luster, color, state of matter, other)2. Test for CONDUCTIVITY3. Test for MALLEABILITY 4. Test for MELTING POINT:
1. Place sample on edge (30-40 sec)2. If it melts- Low3. If it doesn’t move to
middle of hot plate4. If it melts- high
if it doesn’t – very high
HOT PLATE
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Lab RolesThere is no additional lab report, just fill out the sheet I
gave you, answer ?’s on the sheet or the backFor groups of 3: PI + Recorder combined roles
Lab Roles Lab Roles
1. PI (diamond)- in charge of instructions, asking questions, only person allowed to
get sample #9 from me
3. Technician (Clubs)- tests for malleability, gets 3 paper towels, gets samples from the
cart or front table
2. Recorder (Heart)- Tests for conductivity, Reporter for the group, everyone records
on their own sheet
4. MD (Spade)- tests for melting point, in charge of hot plate (before and after lab)