Questions: Use the following to answer questions 12-17: Determine the number of protons and the number of neutrons for each of the following. 12. Rb-85 37 R Rb 85-37=48 n 13. Sn-118 14. C-14 15. I-127 16. Pb-207 17. Hg-201

Use the following to answer questions 12-17:
Determine the number of protons and the number of neutrons for each of the following.
12. Rb-85  37 R Rb 85-37=48 n
13. Sn-118
14. C-14
15. I-127
16. Pb-207
17. Hg-201
Transcript text: Use the following to answer questions 12-17: Determine the number of protons and the number of neutrons for each of the following. 12. $\mathrm{Rb}-85$ ${ }_{37}{ }^{R} \mathrm{Rb}$ $85-37=48 n$ 13. $\mathrm{Sn}-118$ 14. C-14 15. I-127 16. $\mathrm{Pb}-207$ 17. $\mathrm{Hg}-201$
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Solution

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Solution Steps

Step 1: Understanding the Notation

The notation for an element, such as Rb85\mathrm{Rb}-85, indicates the element and its mass number. The mass number is the sum of protons and neutrons in the nucleus.

Step 2: Determine the Number of Protons

The number of protons in an element is given by its atomic number. This can be found on the periodic table. For example, for Rb\mathrm{Rb} (Rubidium), the atomic number is 37, which means it has 37 protons.

Step 3: Determine the Number of Neutrons

The number of neutrons is calculated by subtracting the atomic number from the mass number. For Rb85\mathrm{Rb}-85, the calculation is: 8537=48 85 - 37 = 48 So, Rb85\mathrm{Rb}-85 has 48 neutrons.

Final Answer

  1. Rb85\mathrm{Rb}-85: Protons = 37, Neutrons = 48 Protons: 37, Neutrons: 48\boxed{\text{Protons: 37, Neutrons: 48}}

  2. Sn118\mathrm{Sn}-118:

  • Atomic number of Sn\mathrm{Sn} (Tin) is 50.
  • Neutrons = 11850=68118 - 50 = 68. Protons: 50, Neutrons: 68\boxed{\text{Protons: 50, Neutrons: 68}}
  1. C14\mathrm{C}-14:
  • Atomic number of C\mathrm{C} (Carbon) is 6.
  • Neutrons = 146=814 - 6 = 8. Protons: 6, Neutrons: 8\boxed{\text{Protons: 6, Neutrons: 8}}
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