Introductory Chemistry For Today
8th Edition
ISBN: 9781285644561
Author: Seager
Publisher: Cengage
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- Copper is composed of two naturally occurring isotopes: Cu-63 with a mass of 62.94amuandCu-65 with a mass of 64.93amu. Look up the atomic mass of copper and determine which of the two isotopes is more abundant. a.Cu-63ismoreabundant.b.Cu-65ismoreabundant.c.Bothisotopesareequallyabundant.arrow_forwardThe element lanthanum has two stable isotopes, lanthanum 138 with an atomic mass of 137.9071u and, lanthanum 139 with an atomic mass of 138.9063u. From atomic mass of La, 138.9u what conclusion can you make about the relative percentage abundance of the isotopes?arrow_forwardNaturally occurring sodium has a single isotope. Determine the following for the naturally occurring atoms of sodium: a. The number of neutrons in the nucleus. b. The mass in u of the nucleus to three significant figures.arrow_forward
- Copper (Cu) has an atomic number of 29 and a mass number of 64. One copper atom, therefore, has how many protons? a.27 b.29 c.31 d.35arrow_forwardNaturally occurring aluminum has a single isotope. Determine the following for the naturally occurring atoms of aluminum: a. The number of neutrons in the nucleus. b. The mass in u of the nucleus to three significant figures.arrow_forwardThe CRC Handbook, a large reference book of chemical and physical data, lists two isotopes of rubidium (Z=37). The atomic mass of 72.15 of rubidium atoms is 84.9118u. Through a typographical oversight, the atomic mass of the second isotope is not printed. Calculate that atomic mass.arrow_forward
- The atomic weight of aluminum is 26.98u and the atomic weight of nickel is 58.69u. All aluminum atoms have a mass of 26.98u, but not a single atom of nickel has a mass of 58.69u. Explain.arrow_forwardWrite isotope symbols for neutral atoms with the following characteristics: a. Contain 17 electrons and 20 neutrons b. A copper atom with a mass number of 65 c. A zinc atom that contains 36 neutronsarrow_forwardThe isotope Si-28 has a mass of 27.977 amu. For ten grams of Si-28, calculate (a) the number of atoms. (b) the total number of protons, neutrons, and electrons.arrow_forward
- The atomic mass of lithium on a periodic table is 6.94u. Lithium has two natural isotopes with atomic masses of 6.10512u and 7.01600u. Calculate the percentage distribution between the two isotopes. Pure lithium is composed of two isotopes.arrow_forwardWrite isotope symbols for neutral atoms with the following characteristics: a. Contains 20 electrons and 20 neutrons b. Contains 1 electron and 2 neutrons c. A magnesium atom that contains 14 neutronsarrow_forwardMercury An isotope of mercury has 80 protons and 120 neutrons. What is the mass number of this isotope?arrow_forward
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