Part a which of the following pairs are isotopes of

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7 Help Reset 20 70 22 79 32 Ga 35 Ge 38 Ru 42 Sr 44 Br 20 22 20 Ge 70 32 44 Br 35
Part A Which of the following pairs are isotopes of each other? Hint 1. Definition of an isotope Isotopes are atoms of the same element that have the same number of protons but a different number of neutrons. See Section 4.5 ( Page 118 ) .
2/26/2019 Ch 4 HW 20/23 Correct Core Chemistry Skill: Writing Atomic Symbols for Isotopes Learning Goal: To understand isotope notation and how to use it to determine the number of protons and neutrons and the mass number for atoms. Atoms with the same number of protons but different numbers of neutrons are called isotopes . Some elements only have one naturally occurring isotope, while others such as carbon have two or more. In a naturally occurring sample, isotopes of each element are present in a certain percentage amount called the percent natural abundance . The mass number of an isotope is the sum of the number of protons and the number of neutrons for a particular isotope and is symbolized by . There are several different types of isotope notation. For example, a carbon isotope that has an atomic number of 6 and a mass number of 13 could be symbolized in any of the following ways: , carbon-13, or -13. Part A Enter the appropriate symbol for an isotope of potassium-39 corresponding to the isotope notation . Express your answer as a chemical symbol using isotope notation. Hint 1. How to interpret isotope notation There are several common notations used for isotopes, including where represents the mass number, represents the atomic number, and represents the chemical symbol; and - where represents the chemical symbol or name of the element and represents the mass number. Hint 2. Determine the atomic number of potassium-39 What is the atomic number of potassium-39? Express your answer numerically as an integer. Hint 1. How to determine the atomic number Each element has a unique atomic number, which is equal to the number of protons in the nucleus of an atom. The periodic table of elements is arranged by the atomic number of the elements. For a given element, look above the symbol in the periodic table to find the atomic number. For example, carbon has an atomic number of 6. ANSWER: ANSWER: 12 C and 13 C 19 F and 19 Ne 16 O and 16 N 1 H and 4 He

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