Multiple Choice
How many inner shell electrons does a beryllium (Be) atom have?
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2. Atoms & Elements
The Atom
Multiple 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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