warm up9-21-15 1. convert 25 mg to g 2. how many neutrons are in 85 kr? 3. write the short hand...
Post on 12-Jan-2016
212 Views
Preview:
TRANSCRIPT
Warm UpWarm Up 9-21-159-21-151. Convert 25 mg to g
2. How many neutrons are in 85Kr?
3. Write the short hand electron configuration for Indium and Bromine
HomeworkSept 23 - Test unit 2Sept 23 - Notebook check (6 days of notes for unit 2)
AgendaTurn in WS Test reviewNotes Unit 3-1WS Subatomic heavyweights
Unit 3-1Unit 3-1The Periodic TableThe Periodic Table
How would you organize the How would you organize the following (16) items?following (16) items?
Wrench
Pliers
Clamp
Nuts
Drill
Screwdriver
Boxcutter
allenwrench
Unit 3-1Unit 3-1Periodic LawPeriodic Law
Periodic law Periodic law - periodic - periodic table is organized based table is organized based on the on the atomic #atomic #, chemical , chemical & physical properties of & physical properties of the elementsthe elements
Mendeleev is the creator Mendeleev is the creator of the periodic table used of the periodic table used atomic massatomic mass
The Periodic TableThe Periodic Table
Group or familyGroup or family A vertical columnsA vertical columns Elements in a group share the same chemical Elements in a group share the same chemical
propertiesproperties
PeriodPeriod A horizontal rows A horizontal rows Elements in the same period have the same Elements in the same period have the same
number of energy levelsnumber of energy levels
The Periodic TableThe Periodic Table Elements’ chemical properties are Elements’ chemical properties are
determined by the number of valence determined by the number of valence electrons electrons
Valence electrons Valence electrons are electrons that are in are electrons that are in the outermost energy level of an atom the outermost energy level of an atom (in the S and P orbital only)(in the S and P orbital only)
e- e-e- e- e-
e-
The Periodic TableThe Periodic Table
Average Atomic Mass vs. Mass Average Atomic Mass vs. Mass NumberNumber
What is the mass of neon element?
Average Atomic Mass vs. Mass Average Atomic Mass vs. Mass NumberNumber
The The average atomic average atomic mass is the average of mass is the average of the mass numbers of all the isotopes of the mass numbers of all the isotopes of that element.that element.
Molybdenum Molybdenum probably probably has more isotopes with a mass has more isotopes with a mass number of 96, rather than 95number of 96, rather than 95
Average Atomic Mass and Mass Average Atomic Mass and Mass NumberNumber
Name of Atom
Abundance Percent %
Mass x Percent
Lead-204 1.4 204 x 0.014 = 2.856
Lead-206 24.1 206 x 0.241 = 49.646
Lead-207 22.1 207 x 0.221 = 45.747
Lead-208 52.4 208 x 0.524 = 108.992
What is the average mass of Lead? Based on the given stable isotopes
AssignmentsAssignments
SummarySummary WS Subatomic heavyweights due todayWS Subatomic heavyweights due today Study for Unit 2 test WednesdayStudy for Unit 2 test Wednesday
top related