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Chapter 2: Problem 107

Identify each of the following elements. Give the number of protons and neutrons in each nucleus. a. \(_{15}^{31} \mathrm{X}\) b.\(^{127}_{53} \mathrm{X}\) c. \(_{19}^{39} \mathrm{X}\) d. \(\stackrel{173}{70} \mathrm{X}\)

Short Answer

Expert verified
a. Element X has 15 protons and 16 neutrons. b. Element X has 53 protons and 74 neutrons. c. Element X has 19 protons and 20 neutrons. d. Element X has 70 protons and 103 neutrons.

Step by step solution

01

a. \(_{15}^{31} \mathrm{X}\)

The atomic number (number of protons) is 15 and the mass number (protons + neutrons) is 31. To find the number of neutrons, subtract the atomic number from the mass number: Number of neutrons = Mass number - Atomic number = 31 - 15 = 16. Element X has 15 protons and 16 neutrons.
02

b. \(^{127}_{53} \mathrm{X}\)

The atomic number (number of protons) is 53 and the mass number (protons + neutrons) is 127. To find the number of neutrons, subtract the atomic number from the mass number: Number of neutrons = Mass number - Atomic number = 127 - 53 = 74. Element X has 53 protons and 74 neutrons.
03

c. \(_{19}^{39} \mathrm{X}\)

The atomic number (number of protons) is 19 and the mass number (protons + neutrons) is 39. To find the number of neutrons, subtract the atomic number from the mass number: Number of neutrons = Mass number - Atomic number = 39 - 19 = 20. Element X has 19 protons and 20 neutrons.
04

d. \(\stackrel{173}{70} \mathrm{X}\)

The atomic number (number of protons) is 70 and the mass number (protons + neutrons) is 173. To find the number of neutrons, subtract the atomic number from the mass number: Number of neutrons = Mass number - Atomic number = 173 - 70 = 103. Element X has 70 protons and 103 neutrons.

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Most popular questions from this chapter

Write the formula for each of the following compounds: a. ammonium hydrogen phosphate b. mercury(I) sulfide c. silicon dioxide d. sodium sulfite e. aluminum hydrogen sulfate f. nitrogen trichloride g. hydrobromic acid h. bromous acid i. perbromic acid j. potassium hydrogen sulfide k. calcium iodide l. cesium perchlorate

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