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CHEM 1510 SI Keith - Week 2 Session 2 Worksheet
1. Silicon (Si) has three naturally occurring isotopes: 28 Si, 29Si, and 30Si. Determine the
number of protons, electrons, and neutrons in an atom of each silicon isotope.
2. Titanium (Ti) has five naturally occurring isotopes: 46 Ti, 47Ti, 48 Ti, 49Ti, and 50Ti.
Determine the number of protons, electrons, and neutrons in an atom of each titanium
isotope.
3. How many protons, electrons, and neutrons are in an atom of each of the following and
which elements are bring represented? A) 115 Q
B) 4120 R
C) 13153 X
4. Gallium has two naturally occurring isotopes, 69Ga (isotopic mass = 68.9256 amu,
abundance = 60.11%) and 71Ga (isotopic mass = 70.9247 amu, abundance = 39.89%).
Calculate the atomic mass of gallium.
5. Magnesium has three naturally occurring isotopes 24Mg (isotopic mass = 23.9850 amu,
abundance = 78.99%), 25Mg isotopic mass = 24.9858 amu, abundance = 10.00%), and
26Mg (isotopic mass = 25.9826 amu, abundance = 11.01%). Calculate the atomic mass of
Magnesium.
6. Chlorine has two naturally occurring isotopes, 35Cl (isotopic mass = 34.9689 amu) and
37Cl (isotopic mass = 36.9659 amu). If chlorine has an atomic mass of 35.4527 amu,
what is the percent abundance of each isotope?
7. Copper has two naturally occurring isotopes, 63Cu (isotopic mass = 62.9696 amu) and
65Cu (isotopic mass = 64.9278 amu). If copper has an atomic mass of 63.546 amu, what
is the percent abundance of each isotope?
8.
A compound of copper and sulfur contains 88.39 g of metal and 44.61 g of nonmetal.
How many grams of copper are in 5264 kg of compound? How many sulfur?
9.
Name all the diatomic molecules. (Hint: There should be seven.)
10. K, Na, Rb, Cs are all considered?
___________________________?
11. Si, Ge, As, and Sb are all considered ________________________________?
12. At room temperature and pressure there are two liquids. What are they?
13. Ra, Mg, Ba, and Sr are all considered _________________________________?
14. Name five inner transition metals.
15. Show with calculations how the following data illustrates the law of multiple
proportions.
Compound 1: 47.5 mass % sulfur and 52.5 mass % chlorine
Compound 2: 31.1 mass % sulfur and 68.9 mass % chlorine
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