Multiple Choice
How many inner shell electrons does a beryllium (Be) atom have?
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2. Atoms & Elements
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Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
How many neutrons are present in an atom of iridium (Ir) with a mass number of 193?
A
80
B
77
C
193
D
116
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Verified step by step guidance1
Identify the given information: the element is iridium (Ir) and the mass number (A) is 193.
Recall that the mass number (A) is the sum of protons (Z) and neutrons (N) in the nucleus: \(A = Z + N\).
Find the atomic number (Z) of iridium, which is the number of protons. For iridium, \(Z = 77\).
Rearrange the formula to solve for the number of neutrons: \(N = A - Z\).
Substitute the values: \(N = 193 - 77\), which gives the number of neutrons in the atom.
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