#: Class: Date: Isotopes and Average Atomic Mass 

Yüklə 9,56 Kb.
 tarix 05.03.2018 ölçüsü 9,56 Kb.
 Name: KEY #: _____ Class: _____ Date: _________________ Isotopes and Average Atomic Mass  Use the information given about each element to determine if the pair of elements are isotopes or different elements. Element D has 6 protons and 7 neutrons. Element F has 7 protons and 7 neutrons. Different elements Element J has 27 protons and 32 neutrons. Element L has 27 protons and 33 neutrons. Isotopes Element X has 17 protons and 18 neutrons. Element Y has 18 protons and 17 neutrons. Different elements Element Q has 56 protons and 81 neutrons. Element F has 56 protons and 82 neutrons. Isotopes Element T has an atomic number 20 and mass number 40. Element Z has an atomic number 20 and mass number 41. Isotopes Element P has an atomic number 92 and mass number 238. Isotopes Element S has 92 protons and 143 neutrons. The average atomic mass is the weighted average of all the isotopes of an element. Determine the average atomic mass. Rubidium is a soft, silvery-white metal that has two common isotopes, 85Rb and 87Rb. If the abundance of 85Rb is 72.2% and the abundance of 87Rb is 27.8%, what is the average atomic mass of rubidium? 85Rb 0.722 x 85= 61.37 87Rb 0.278 x 87= + 24.186 86.556 amu Naturally occurring chlorine that is put in pools is 75.53% 35Cl and 24.47% 37Cl. Calculate the average atomic mass. 35Cl 0.7553 x 35= 25.4355 37Cl 0.2447 x 37= +9.0539 34.4894 amu Copper used in electric wires comes in two isotopes: 63Cu and 65Cu. 63Cu has an abundance of 69.09%. The other isotope, 65Cu, has an abundance of 30.91%. Calculate the average atomic mass of copper. 63Cu 0.6909 x 63= 43.5267 65Cu 0.3091 x 65= +20.0915 63.6182 amu Hydrogen has three common isotopes: 1H (99%), 2H (0.8%), and 3H (0.2%). What is the average atomic mass of hydrogen? 1H 0.99 x 1= 0.99 2H 0.008 x 2 0.016 3H 0.002 x 3= + 0.006 1.012 amu Dostları ilə paylaş:

Verilənlər bazası müəlliflik hüququ ilə müdafiə olunur ©genderi.org 2019
rəhbərliyinə müraciət

Ana səhifə