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CHM 111 Q1. Chapter 2 Worksheet: Atoms and Elements Name ___________________________ Complete the missing entries in the following table of neutral...

Complete the missing entries in the following table
Symbol
52Cr3+
# Protons
25
34
# Neutrons
30
# Electrons
25
26
Mass number
56
78
Charge on the ion
2+
2-
Q9. List
CHM 111 Chapter 2 Worksheet: Atoms and Elements Name ___________________________ Q1. Complete the missing entries in the following table of neutral elements Symbol 23 Na # Protons 27 86 # Neutrons 33 16 125 # Electrons 15 82 Mass number 222 Q2. Name the following elements and classify them as metals, non-metals or metalliods. a) N b) C c) P d) Mn e) Mg f) Co g) Si h) Cu i) As Q3. Write the symbol of the following elements and classify them as metals, non-metals or metalliods a) Nitrogen b) Germanium c) Sulfur d) Boron e) Bromine f) Titanium Q4. How many atoms are present in 0.23 moles of Calcium? Q5. Silicon is naturally occurring as 28 Si, 29 Si and 30 Si. Given the following information, calculate the average atomic mass of silicon. Isotope isotopic mass (amu) % abundance 28 Si 27.9769 92.21 29 Si 28.9765 4.70 30 Si 29.9738 3.09 Q6. How many atoms are present in 5.6 mg of Silicon?
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Q7. How many grams of iodine do 5.6 x 10 25 atoms of iodine represent? Q8. Complete the missing entries in the following table Symbol 52 Cr 3+ # Protons 25 34 # Neutrons 30 # Electrons 25 26 Mass number 56 78 Charge on the ion 2+ 2- Q9. List three characteristics of metals. Q11. How can Iodine (Z = 53) have a higher atomic number yet have a lower atomic mass than Tellurium (Z = 52)? Q12. How many oxygen atoms are there is 75.5 grams of O? Q13. Naturally occurring copper, Cu, is composed of two isotopes. The isotope copper-63 is 69.17% of naturally occurring copper and has an atomic mass of 62.94 amu. The isotope copper-65 has an atomic mass of 64.93 amu. a) What percent of naturally occurring copper is copper-65? b) Calculate the average atomic mass of naturally occurring copper.
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This question was asked on Jan 26, 2013.

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