Average Atomic Mass

Which of the following statements about strong and weak nuclear forces is INCORRECT?

Both promote beta decay.

Scientists investigate the atomic structure and the interactions between subatomic particles by performing experiments. They formulate theories to explain the phenomena observed. Through this scientific approach, it has been possible to establish that despite the ____ mutual electromagnetic ____, the protons and _____ are held together by the ____ nuclear force.

A. Protons
B. Repulsion
C. Neutrons
D. Strong

 Uranium has three common isotopes: U-238 (99.2745%), U-235 (0.7200%), U-234 (0.0055%). Calculate the average atomic mass of uranium to TWO decimal places. ___ amu?

237.98

Silver has two isotopes, silver-107 (52.00%), and silver-109 (48.00%). What is the atomic mass of silver? Show all work.

107 × 0.5200 = 55.64 (52/100 = 0.52)
109 × 0.4800 = 52.32 (48/100 = 0.48)
52.34 + 55.64 = 107.96 amu

Use the following information to calculate the average atomic mass of iodine. Round your answer to two decimal places. Iodine-127 (80%), Iodine-126 (17%), Iodine-128 (3%)

126 amu