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 ›...
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?
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
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
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
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)