Transcript Need to Know - inetTeacher.com

History
Dmitri Mendeleev
1896
1951 - Seaborg
Developed the modern periodic table
The Whole Periodic table
Groups vs. Periods
Need to Know:
Halogens
Noble Gas
Alkali Metals
Alkaline Earth
Transition Metals
Lanthanides
Actanides
Groups: Up and Down
Periods: Left to Right
Periodic Table
Atomic Number
Symbol
Name
Atomic Mass
**Mass Number
can not be found
on the periodic
Element Symbol
Mass Number
Symbol
Atomic Number
Atoms
What do we know MUST be in an atom?
(3 particles)
Ions
How is an ion formed?
Ions
If an ion has a charge of -2, what has
happened to the atom?
The atom has gained two electrons
If an ion has a charge of +2, what has
happened to the atom?
The atom has lost two electrons
Isotopes
Count the
neutrons
and protons
Proton
Neutron
http://www.green-planet-solar-energy.com/images/helium-isotopes-5-to-8.gif
Natural State of an Element
Questions?
Quiz Time
Acceptable Answers
Correct Answer
Good Luck
You have 7 minutes to
complete your quiz.
When you are done, hold on
to it and wait patiently.
AverageRelative
Atomic Size
Mass Calcs
1 atomic mass unit (amu) = 1.66054x10-27 kg,
Mass of an electron = 9.10939x10-31 kg
Mass of a proton = 1.67262x10-27 kg
Mass of a neutron = 1.67493x10-27 kg
**You will NOT need to memorize these numbers.
Always given to you.
Average Atomic Mass Calcs
Carbon has 2 common isotopes. 126C and 136C. If the
abundance of the two isotopes is 98.89% and 1.11 %
respectively, what is the average atomic mass of
carbon in amu?
Carbon 12
Neutrons
Protons
Electrons
Carbon 13
12
6
C
6 protons 1.67262x10-27 kg
1 proton
6 electrons 9.10939x10-31 kg
1 electron
6 neutrons 1.67493x10-27 kg
1 neutron
1 amu
= 6.04364 amu
1.66054x10-27 kg
1 amu
= 0.0032915 amu
1.66054x10-27 kg
1 amu
= 6.05200 amu
1.66054x10-27 kg
6.04364 amu + 6.05200 amu + 0.0032915 amu =12.09893 amu
13
6C
6 protons 1.67262x10-27 kg
1 proton
7 neutrons 1.67493x10-27 kg
1 neutron
6 electrons 9.10939x10-31 kg
1 electron
1 amu
= 6.04364 amu
1.66054x10-27 kg
1 amu
= 7.06066 amu
1.66054x10-27 kg
1 amu
= 0.0032915 amu
1.66054x10-27 kg
6.04364 amu + 7.06066 amu + 0.0032915 amu = 13.10755 amu
Putting It All Together
What we know:
Carbon 12: 12.09893 amu (98.89% abundance)
Carbon 13: 13.10755 amu (1.11% abundance)
Therefore:
(12.09893 amu x 0.9889) + (13.10755 amu x 0.0111)
12.01101 amu
Homework
*Attempt problem #1 on Average
Atomic Mass Calculations WS
Read and notes 3.5, 3.7, 3.8