PPT-Average atomic mass worksheet

1 Rubidium has two common isotopes 85 Rb and 87 Rb If the abundance of 85 Rb is 722 and the abundance of 87 Rb is 278 what is the average atomic mass of rubidium PROCEDURE. Chemistry. Ms. Pollock. 2013 - 2014. Introduction. Dalton’s atomic theory very good but not entirely correct. Atoms able to be broken into smaller particles. Electrons, Protons, and Neutrons. Electrons. What is it?. Isotopes are different versions of atoms having the same number of protons but different numbers of neutrons.. Atomic Mass. The mass of each isotope is different due to the different number of neutrons.. Atomic Mass. What is an elements atomic mass?. The weighted average of its naturally occurring isotopes. .. When looking at an element on the periodic table of elements, where is atomic mass found?. Usually the top left hand corner of each elements box. However, on the periodic table that you will use for your AP Exam(s), this number will be located below each elements chemical symbol.. Average Atomic Mass. An element can exist in a number of forms, called isotopes. Isotopes are forms of the same atom that vary in . mass as a result of a different number of neutrons..  . Isotopes. Steps for Calculating Average Atomic Mass. (. When given percentages of each isotope and each isotopes mass). 1. Convert the percentages into decimals. (This percentage is known as . its . relative . #1: Rubidium has two common isotopes, . 85. Rb and . 87. Rb. . If the abundance of . 85. Rb is 72.2% and the abundance of . 87. Rb is 27.8%, what is the average atomic mass of rubidium?. PROCEDURE:. III. How atoms differ. . A. Atomic Number. Equal to the number of protons – never changes; equals the number of electrons if AND ONLY IF the atom is . neutral. ; Moseley discovered . each atom has a unique number of protons in the nucleus. Over the past century scientist have discovered that the atom is composed of 3 subatomic particles:. Protons. Neutrons. Electrons. Checking for understanding. Draw this diagram. Label all subatomic particles and include their charges.. Present and Future. WANG . Meng. Institute of Modern Physics, CAS. ARIS2014, Tokyo, June 2. Outline. Introduction. . atomic mass, measurement, evaluation …. Present status. . publication of . 2.3: Atomic structure & symbolism. Write & interpret symbols that depict atomic number, atomic mass and charge of atoms & ions. Define the atomic mass unit & average atomic mass. Calculate average atomic mass & isotopic abundance. Atomic . Mass Number. Where did that decimal come from?. Calculating Average Atomic Mass . I CAN . calculate the Average Atomic Mass Number of an element from its isotope data. .. The Case for a Decimal . Atoms of the same element . can. have different . mass numbers.. Isotopes. How can atoms of the same element end up with a different mass?. Shoulder Partners. Frederick Soddy. (1877-1956) proposed the idea of isotopes in 1912. Mass (. amu. ). Location. Electron. e. -. -1. About. 0.000544. Surrounding nucleus. Proton. p. +. +1. About 1. Inside nucleus. Neutron. n. 0. 0. About 1. Inside nucleus. Isotopes. J.J. Thomson saw that there were two different neon atoms in the cathode ray tube. Daltons Atomic Theory. 1. All elements are composed of tiny . indivisible. particles called atoms.. 2. Atoms of the same element are identical. The atoms of one element are different from the atoms of another element..