QuestionJuly 21, 2025

What is the number of neutrons (n), for Kr-81 40 36 45

What is the number of neutrons (n), for Kr-81 40 36 45
What is the number of neutrons (n), for Kr-81
40
36
45

Solution
4.4(217 votes)

Answer

45 Explanation 1. Identify the atomic number Krypton (Kr) has an atomic number of 36, which means it has 36 protons. 2. Determine the mass number The isotope Kr-81 indicates a mass number of 81. 3. Calculate the number of neutrons Use the formula: **Number of Neutrons = Mass Number - Atomic Number**. Thus, n = 81 - 36.

Explanation

1. Identify the atomic number<br /> Krypton (Kr) has an atomic number of 36, which means it has 36 protons.<br />2. Determine the mass number<br /> The isotope Kr-81 indicates a mass number of 81.<br />3. Calculate the number of neutrons<br /> Use the formula: **Number of Neutrons = Mass Number - Atomic Number**. Thus, $n = 81 - 36$.
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