Understanding Isotopes and Atomic Mass

What are the two naturally occurring isotopes of silver mentioned in the problem?

• Silver 105 and Silver 107

• Silver 107 and Silver 109

• Silver 108 and Silver 110

• Silver 106 and Silver 108

What is the atomic mass of silver as given in the problem?

• 108.905 amu

• 106.905 amu

• 109.870 amu

• 107.870 amu

What does the formula for atomic mass involve?

• Ratio of isotope masses

• Difference of isotope masses

• Product of fraction and mass of isotopes

• Sum of isotope masses

Why is a second equation needed in this problem?

• To calculate atomic number

• To solve for two unknowns

• To determine isotope stability

• To find the mass of isotopes

What is the second equation based on?

• The difference in isotope masses

• The sum of isotope fractions equals one

• The product of isotope fractions

• The sum of isotope masses

What method is used to solve the system of equations?

• Trial and error

• Substitution

• Graphing

• Elimination

What is the purpose of multiplying one equation by a factor?

• To simplify the equation

• To find the atomic number

• To increase the number of equations

• To cancel out a variable

What is the calculated fraction of silver 109?

• 0.7825

• 0.6825

• 0.5825

• 0.4825

How is the fraction of silver 109 converted to percent abundance?

• By dividing by 100

• By multiplying by 100

• By adding 100

• By subtracting 100

What is the percent abundance of silver 109?

• 48.25%

• 38.25%

• 68.25%

• 58.25%