A. Isotopes Review
Isotope
Isotope
Notation
Mass
Number
(P+N)
Atomic
Number
(P)
Number of
Neutrons
Number
of
Protons
Number of
Electrons
11
12
10
7
7
10
4
5
2
17
18
18
Net
Charge
( P -E )
B. AVERAGE ATOMIC MASS PROBLEMS (fictitous elements)
1. What is the average atomic mass of Unobtanium (Uo), an element known for its anti-gravity properties .
Use the mass numbers and abundances below. “Avatar”
Mass number
Abundance
Uo-310
90%
Uo-312
10%
Average Atomic Mass
2. What is the average atomic mass of Uru (Uru) , a highly immalleable metal and is most famous example of
it is the enchanted hammer, Mjolnir ? Use the mass numbers and abundances below. “Thor”
Mass number
Abundance
Uru-318
75 %
Uru-320
20 %
Average Atomic Mass
Uru-325
5%