Chemistry for Today: General, Organic, and Biochemistry
Chemistry for Today: General, Organic, and Biochemistry
9th Edition
ISBN: 9781305960060
Author: Spencer L. Seager, Michael R. Slabaugh, Maren S. Hansen
Publisher: Cengage Learning
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Chapter 2, Problem 2.19E
Interpretation Introduction

(a)

Interpretation:

The mass number and atomic number for an atom containing nucleus made up of 6 protons and 6 neutrons are to be calculated and the symbol for an atom is to be stated.

Concept introduction:

The atomic number of an atom is equal to the number of protons in an atom. Mass number of an atom can be calculated by taking the sum of atomic number and number of neutrons. The general isotopic symbol for an atom is represented as given below.

xyA

Expert Solution
Check Mark

Answer to Problem 2.19E

The mass number and atomic number for an atom containing nucleus made up of 6 protons and 6 neutrons are 12 and 6 respectively. The symbol is represented as 612C.

Explanation of Solution

The given atom contains 6 protons and 6 neutrons. It is known that the atomic number of an atom is equal to the number of protons. Therefore, the atomic number of the given atom is 6.

The formula to calculate mass number is,

Massnumber=Atomicnumber+numberofneutrons

Substitute the values in the above equation.

Massnumber=Atomicnumber+numberofneutrons=6+6=12

The general representation of an atom is as follows.

xyA

Where,

x represents the atomic number of the atom A.

y represents the mass number of the atom A.

The atom with atomic number 6 is carbon and it has atomic symbol C. The mass number calculated for it, is 12. Thus, the symbol for carbon can be written as given below.

612C

Conclusion

The mass number and atomic number for an atom containing nucleus made up of 6 protons and 6 neutrons are calculated as 12 and 6 respectively. The symbol is represented as 612C.

Interpretation Introduction

(b)

Interpretation:

The mass number and atomic number for atom containing nucleus made up of 8 protons and 9 neutrons are to be calculated and the symbol for an atom is to be stated.

Concept introduction:

The atomic number of an atom is equal to the number of protons in an atom. Mass number of an atom can be calculated by taking the sum of atomic number and number of neutrons. The isotopic symbol for an atom is represented as given below.

xyA

Expert Solution
Check Mark

Answer to Problem 2.19E

The mass number and atomic number for an atom containing nucleus made up of 8 protons and 9 neutrons are 17 and 8 respectively. The symbol is represented as 817O.

Explanation of Solution

The given atom contains 8 protons and 9 neutrons. It is known that the atomic number of an atom is equal to the number of protons. Therefore, atomic number of the given atom is 8.

The formula to calculate mass number is,

Massnumber=Atomicnumber+numberofneutrons

Substitute the values in the above equation.

Massnumber=Atomicnumber+numberofneutrons=8+9=17

The representation of an atom is as follows.

xyA

Where,

x represents the atomic number of the atom A.

y represents the mass number of the atom A.

The atom with atomic number 8 is oxygen and it has atomic symbol O. The mass number calculated for it, is 17. Thus, the symbol for oxygen can be written as given below.

817O

Conclusion

The mass number and atomic number for an atom containing nucleus made up of 8 protons and 9 neutrons are calculated as 17 and 8 respectively. The symbol is represented as 817O.

Interpretation Introduction

(c)

Interpretation:

The mass number and atomic number for atom containing nucleus made up of 20 protons and 25 neutrons are to be calculated and the symbol for an atom is to be stated.

Concept introduction:

The atomic number of an atom is equal to the number of protons in an atom. Mass number of an atom can be calculated by taking the sum of atomic number and number of neutrons. The general isotopic symbol for an atom is represented as given below.

xyA

Expert Solution
Check Mark

Answer to Problem 2.19E

The mass number and atomic number for an atom containing nucleus made up of 20 protons and 25 neutrons are 45 and 20 respectively. The symbol is represented as 2045Ca.

Explanation of Solution

The given atom contains 20 protons and 25 neutrons. It is known that the atomic number of an atom is equal to the number of protons. Therefore, atomic number of the given atom is 20.

The formula to calculate mass number is,

Massnumber=Atomicnumber+numberofneutrons

Substitute the values in the above equation as given below.

Massnumber=Atomicnumber+numberofneutrons=20+25=45

The representation of an atom is as follows.

xyA

Where,

x represents the atomic number of the atom A.

y represents the mass number of the atom A.

The atom with atomic number 20 is calcium and it has atomic symbol Ca. The mass number calculated for it, is 45. Thus, the symbol for calcium can be written as given below.

2045Ca

Conclusion

The mass number and atomic number for atom containing nucleus made up of 20 protons and 25 neutrons are calculated as 45 and 20 respectively. The symbol is represented as 2045Ca.

Interpretation Introduction

(d)

Interpretation:

The mass number and atomic number for atom containing nucleus made up of 52 protons and 78 neutrons are to be calculated and the symbol for the atom is to be stated.

Concept introduction:

The atomic number of an atom is equal to the number of protons in an atom. Mass number of an atom can be calculated by taking the sum of atomic number and number of neutrons. The isotopic symbol for an atom is represented as given below.

xyA

Expert Solution
Check Mark

Answer to Problem 2.19E

The mass number and atomic number for an atom containing nucleus made up of 52 protons and 78 neutrons are 130 and 52 respectively. The symbol is represented as 52130Te.

Explanation of Solution

The given atom contains 52 protons and 78 neutrons. It is known that the atomic number of an atom is equal to the number of protons. Therefore, atomic number of the given atom is 52.

The formula to calculate mass number is,

Massnumber=Atomicnumber+numberofneutrons

Substitute the values in the above equation.

Massnumber=Atomicnumber+numberofneutrons=52+78=130

The representation of an atom is as follows.

xyA

Where,

x represents the atomic number of the atom A.

y represents the mass number of the atom A.

The atom with atomic number 52 is tellurium and it has atomic symbol Te. The mass number calculated for it, is 130. Thus, the symbol for tellurium can be written as given below.

52130Te

Conclusion

The mass number and atomic number for an atom containing nucleus made up of 52 protons and 78 neutrons are calculated as 130 and 52 respectively. The symbol is represented as 52130Te.

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Chapter 2 Solutions

Chemistry for Today: General, Organic, and Biochemistry

Ch. 2 - Determine the number of electrons that would have...Ch. 2 - Determine the number of electrons that would have...Ch. 2 - Determine the number of electrons and protons...Ch. 2 - Determine the number of electrons and protons...Ch. 2 - Prob. 2.15ECh. 2 - Prob. 2.16ECh. 2 - Write symbols like those given in Exercises 2.15...Ch. 2 - Write symbols like those given in Exercises 2.15...Ch. 2 - Prob. 2.19ECh. 2 - Prob. 2.20ECh. 2 - Write isotope symbols for neutral atoms with the...Ch. 2 - Write isotope symbols for neutral atoms with the...Ch. 2 - Write the symbols and names for two elements whose...Ch. 2 - Round atomic weights to the nearest whole number,...Ch. 2 - Round atomic weights to the nearest whole number,...Ch. 2 - What are the symbol and name for an element whose...Ch. 2 - In the first 36 elements, 6 elements have atoms...Ch. 2 - What are the symbol and name of the element whose...Ch. 2 - Prob. 2.29ECh. 2 - Prob. 2.30ECh. 2 - The molecular weight was determined for a gas that...Ch. 2 - A flammable gas is known to contain only carbon...Ch. 2 - Glycine, an amino acid found in proteins, has a...Ch. 2 - Serine, an amino acid found in proteins, has a...Ch. 2 - Naturally occurring sodium has a single isotope....Ch. 2 - Naturally occurring aluminum has a single isotope....Ch. 2 - Calculate the atomic weight of lithium on the...Ch. 2 - Calculate the atomic weight of boron on the basis...Ch. 2 - Calculate the atomic weight of silicon on the...Ch. 2 - Calculate the atomic weight of copper on the basis...Ch. 2 - Refer to the periodic table and determine how many...Ch. 2 - Refer to the periodic table and determine how many...Ch. 2 - Write three relationships equalities based on the...Ch. 2 - Write three relationships equalities based on the...Ch. 2 - Use a factor derived from the relationships...Ch. 2 - Use a factor derived from the relationships...Ch. 2 - Prob. 2.47ECh. 2 - Refer to the periodic table and calculate the...Ch. 2 - Prob. 2.49ECh. 2 - Prob. 2.50ECh. 2 - Answer the following questions based on the...Ch. 2 - Answer the following questions based on...Ch. 2 - How many moles of N2O5 contain the same number of...Ch. 2 - How many grams of C2H6O contain the same number of...Ch. 2 - Prob. 2.55ECh. 2 - Determine the mass percentage of hydrogen in CH4...Ch. 2 - Prob. 2.57ECh. 2 - Prob. 2.58ECh. 2 - Urea (CH4N2O) and ammonium sulfate (N2H8SO4) are...Ch. 2 - Prob. 2.60ECh. 2 - Prob. 2.61ECh. 2 - Prob. 2.62ECh. 2 - Prob. 2.63ECh. 2 - The mass of a single carbon 12 atom is 1.991023g....Ch. 2 - Prob. 2.65ECh. 2 - Prob. 2.66ECh. 2 - a. Explain how atoms of different elements differ...Ch. 2 - The atomic weight of aluminum is 26.98u and the...Ch. 2 - Answer the question in the caption of Figure 2.3...Ch. 2 - Answer the question in the caption of Figure 2.5...Ch. 2 - Prob. 2.71ECh. 2 - Prob. 2.72ECh. 2 - Prob. 2.73ECh. 2 - Prob. 2.74ECh. 2 - Prob. 2.75ECh. 2 - Which one of the following substances is a...Ch. 2 - Which of the following is true about compounds?...Ch. 2 - C1734l has a.17 protons, 17 electrons, and 17...Ch. 2 - If two atoms are isotopes, they will a.have same...Ch. 2 - Copper (Cu) has an atomic number of 29 and a mass...Ch. 2 - Atoms are electrically neutral. This means that an...Ch. 2 - The negative charged particle found within the...Ch. 2 - Prob. 2.83ECh. 2 - Prob. 2.84ECh. 2 - The mass of an atom is almost entirely contributed...Ch. 2 - Which of the following is the chemical symbol for...Ch. 2 - Prob. 2.87ECh. 2 - What is the mass number of an atom with 60...Ch. 2 - Which of the following represents Avogadros...Ch. 2 - Which of the following has the greatest number of...Ch. 2 - The formula of carbon dioxide is CO2. Its...Ch. 2 - What is the molar mass of calcium oxide, CaO? a....Ch. 2 - How many grams are contained in 0.200mol of...Ch. 2 - How many moles are contained in a 54.0g sample of...
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