Questions

1. If lithium has an atomic number of 3 and a mass number of 7, the correct number of protons, neutrons, and electrons, respectively, is:

A. 3,4,3

B. 4,3,3

C. 3,3,4

D. 4,4,3

2. If Magnesium has an atomic number of 12 and a mass number of 24, the correct number of protons, neutrons, and electrons, respectively, is:

A. 8,10,12

B. 12,12,12

C. 12,24,12

D. 24,12,12

3. If Zinc has an atomic number of 30 and a mass number of 65, the correct number of protons, neutrons, and electrons, respectively, is:

A. 30,35,35

B. 30,35,30

C. 35,30,35

D. 95,65,30

4. If Bromine has an atomic number of 35 and has 45 neutrons, what is its mass number?

A. 35

B. 45

C. 10

D. 80

5. If Aluminum has an atomic number of 13 and has 14 neutrons, what is its mass number?

A. 1

B. 27

C. 13

D. 14

6. If Uranium's atomic number is 92 and it has 10 neutrons, how many protons does it have?

A. 82

B. 102

C. 92

D. 10

7. If Sodium has an atomic number of 11 and a mass number of 23, how many protons, neutrons, and electrons does it have, respectively?

A. 11,12,12

B. 12,11,12

C. 11,12,11

D. 12,12,11

8. If Phosphorus has an atomic mass of 30 and 15 neutrons, how many protons does it has?

A. 15

B. 45

C. 30

D. 60

9. If carbon has an atomic mass of 12 and 6 neutrons, how many protons and electrons does it have, respectively?

A. 6,6

B. 6,12

C. 12,6

D. 24,6

10. If Potassium has 19 protons, 19 electrons, and 20 neutrons, what is its atomic mass?

A. 1

B. 58

C. 39

D. 29

1. What is average atomic mass of Lithium if 7.42% exists as 6Li (6.015 g/mol) and 92.58% exists as 7Li (7.016 g/mol)?

2. In a sample of 200 Chlorine atoms, it is found that 151 are 35Cl (34.969 g/mol), and 49 are37Cl (36.966 g/mol). What is the average atomic mass of Chlorine?

3. In a sample of 400 Lithium atoms, it is found that 30 atoms are Lithium-6 (6.015 g/mol) and 370 atoms are Lithium-7 (7.016 g/mol). Calculate the average atomic mass of Lithium and enter the number below. Use two decimal places

4. Iodine has an average atomic mass of 126.905 g/mol. What is the isotopic mass of the most common isotope of Iodine?

5. Ammonium nitrate (NH4NO3) is an ionic subtance.

Relative atomic masses: H=1, N=14, O= 16.

Calculate the relative atomic mass of ammonium nitrate. Show clearly how you work out your answer.