A radioactive nuclide that is used to label blood platelets has 49 protons and 62 neutrons. Which is the symbol of this nuclide?
${ }_{62}^{49} \ln$
${ }_{49}^{62} \ln$
${ }_{111}^{49} \ln$
${ }_{49}^{111} \ln
Answer (2)
Determine the atomic number (Z) which equals the number of protons: Z = 49 .
Determine the mass number (A) which is the sum of protons and neutrons: A = 49 + 62 = 111 .
Identify the element symbol for atomic number 49, which is Indium (In).
Write the nuclide symbol in the form Z A X : 49 111 ln .
Explanation
Understanding the Problem We are given a radioactive nuclide with 49 protons and 62 neutrons. We need to determine the correct symbol for this nuclide. The general form of a nuclide symbol is Z A X , where Z is the atomic number (number of protons), A is the mass number (number of protons + number of neutrons), and X is the element symbol.
Calculating Atomic and Mass Numbers The atomic number Z is equal to the number of protons, which is 49. The mass number A is the sum of the number of protons and neutrons, so A = 49 + 62 = 111 .
Determining the Element Symbol and Writing the Nuclide Symbol The element with atomic number 49 is Indium (In). Therefore, the symbol for this nuclide is 49 111 I n .
Final Answer The correct symbol for the radioactive nuclide is 49 111 ln .
Examples
Radioactive nuclides are used in medicine for both diagnostic and therapeutic purposes. For example, a nuclide like the one in this problem, 111 ln , could be attached to blood platelets to track their movement and identify blood clots or other circulatory issues. By understanding the composition and notation of nuclides, scientists and doctors can accurately use these tools to diagnose and treat diseases.
The symbol for the radioactive nuclide with 49 protons and 62 neutrons is 49 111 In . This is because the atomic number (Z) represents protons, which is 49, and the mass number (A) is the sum of protons and neutrons, which totals 111.
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