1. Chemistry – Nov 3, 2017
P3 Challenge- (must show work) 2nd period --- notes on this first (get ready)
Determine the atomic mass of Boron given the following information
Boron 10 Mass: % Abundance: 19.9
Boron 11 Mass: % Abundance: 80.1
Recall Atomic mass = (Mass)(Abund) + (Mass)(Abund) + etc…
Objective –
Beanium Lab Activity
Get out Atoms, Ions and Mass Worksheet for Hmk check

2. Chemistry – Nov 3, 2017 Agenda – Homework Review
Atomic Mass (if needed)
Beanium Lab Activity
Three isotope names of beans are like chocolates: White, Milk, and Dark
Assignment: -
Beanium Lab Activity questions

3. Atomic Mass Given the symbol m
Average mass of the atom in amu (decimal value)
Weighted average
Each isotope has its own atomic mass
For any sample of an element, the particular isotopes present will reflect to natural abundance of each type of isotope found on earth.
Ex: Ne % Ne % Ne %
Each isotope has its own mass: , ,

4. Average Atomic Mass
Atomic Mass on periodic table is a weighted average.
To calculate atomic mass
Let Mn= the mass of isotope n (amu)
Let abn= the relative abundance of isotope n (percent as a decimal)

5. Homework Review Element Symbol Z A #p #n #e charge Oxygen 16O2- 8 1610 2-
Hydrogen 1H 1
3H+ 3 2 +
Carbon
14C 6 14
12C 12
Zinc
65Zn 30 65 35
Potassium
39K+ 19 39 20 18

6. Homework Review Element Symbol Z A #p #n #e charge Titanium 48Ti2+ 2226 20 2+
Antimony
122Sb 51
122 71
Uranium
238U 92
238
146
Silver
108Ag 47
108 61
Fermium
257Fm
100
257
157
Platinum
195Pt 78
195
117
Krypton
84Kr 36 84

7. Homework Review 1. Equal , Z = #p 2. A = #p+#n
3. # protons OR atomic number OR Z
4. charge = #p – #e
Show work for 5 and 6: (Mass)(Ab) + (Mass)(Ab) (Ab% in decimal form….move decimal 2 to left)
5. Li = amu Agrees with Periodic Table
6. Ar = amu Agrees with Periodic Table
% Na
% Al and 47.1 % O
g carbon dioxide

8. Exit Slip - Homework Exit Slip:
Clean up your lab space with a zero impact from when you came in.
What’s Due? (Pending assignments to complete.)
Beanium Lab Activity questions
What’s Next? (How to prepare for the next day)
Read Holt p