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Favorite Answer. This is a weighted average. Multiply each weight by its percentage of the whole. 127*80% + 126*17% + 128*3% = x*100%. 101.6 + 21.42 + 3.84 = 126.86. Check against a periodic table,... Comprehensive data on the chemical element Iodine is provided on this page; including scores of properties, element names in many languages, most known nuclides of Iodine. Common chemical compounds are also provided for many elements. The atomic mass is sort of an average of all of the different isotopes of an element. Mercury's atomic mass is 200.59, but we can round that to 201 (this is known as the mass number). This is a tally of the total number of particles in an atom's nucleus, so an 'average' atom of mercury contains 201 particles in its nucleus. Calculating Average Atomic Mass Heininger November 19, 2012 Nov 157:35 AM 1. Both have the same number of protons (92). They are different because uranium-235 has 143 neutrons and uranium-238 has 146 neutrons. 2. An isotope is an atom that has the same number of protons but a different number of neutrons in its nucleus. 3. atomic number 4 ... The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit (amu, also known as daltons, D).The atomic mass is a weighted average of all of the isotopes of that element, in which the mass of each isotope is multiplied by the abundance of that particular isotope. Mass Number vs. Atomic Mass • Mass Number is the sum of protons + neutrons for each natural elemental isotopes (ex. C-12, C-13, and C14). • Atomic Mass is the number that represents the average of the elements isotopes in nature weighted by percentage abundance (ex. C=12.01 amu). Because the mass of an electron is 0.000549 amu, its mass can be ignored in the atomic mass. The number of protons in any atom of iodine will be the same as defined by its atomic number, 53. This ... On the other hand, iodine's isotope distribution is 127-I (100%). Clearly, you can see that because there is a substantial amount of mass being contributed to Te from its heaviest, natural, isotope and because iodine only has one stable isotope, that the atomic weights of these two elements are reversed.The element rubidium has two naturally occurring isotopes. The atomic mass of 85Rb (72.17 percent abundant) is 84.911794 amu. Determine the atomic mass of 87Rb (27.83 percent abundant). The average atomic mass of Rb is 85.4678 amu. The average atomic mass Is the weighted average of all the Isotopes of an element, Example: A sample bf cesium Is 75% 133Cs, 20% 132Cs and 5% lwCs. What Is its average atomic mass? Answer; .75 x 133 = 99.75.20 x 132 = 26,4,05 x 134 = 6.7 Total = 132.85 amu ~ average atomic mass' Determine the average atomic mass of the following mixtures of ... How many protons does an atom of Iodine (I), #53, have if it has an atomic mass of 127? Answers ( 1) D. Dice 21 November, 03:47. 0. Iodine has 53 protons. mass of a mole of any substance, which is known as its molar mass (Mm), equals its atomic or molecular weight expressed in grams. For example, the atomic weight of Mg is 24.3, so its molar mass is 24.3 g.mol-1, and the molecular weight of CO 2 is 44.0, so its molar mass is 44.0 g.mol-1. Thus, molar mass allows us to quickly convert a mass into a Sep 04, 2009 · Element X is probably sulfur. A look at the stable isotopes of sulfur indicates that the 95.0% is closer to 94.93%. Most periodic tables report the average atomic mass of sulfur to three decimal places: 32.065 amu. Read Free Calculating Average Atomic Mass Worksheet AnswersCalculate the average atomic mass for the three isotopes of Silicon. Calculating Average Atomic Mass Worksheet Calculate the average atomic mass of copper. 3. Calculate the average atomic mass of sulfur. if 95.00% of all sulfur atoms have a mass of 31.972 u, 0.76% . Page 4/27 The atomic weight is a weighted average of all of the naturally occurring isotopes of the element. As it happens, there is only one stable isotope of iodine, I-127, with an atomic mass of 126.904 amu (to three decimal places). Therefore, the mass of a single stable iodine atom is known from the atomic weight on the periodic table.