Isotopes Quiz

1. 1In an isotope, which part of the atom changes?

   1. AProtons
   2. BNeutrons
   3. CElectrons
2. 2How does it change?

   1. AThere are different numbers of them.
   2. BThey move to a different place.
   3. CThey're not there anymore.
3. 3Calculator time! 19.9% of all Boron atoms are Boron-10. 80.1% are Boron-11. Calculate the approximated relative atomic mass of Boron, to one decimal place.
   
   Answer: [blank_start]10.8[blank_end]

   1. A10.8
4. 4Magnesium has three of it's own isotopes. 78.7% is Magnesium-24. 10.13% is Magnesium-25. 11.17% is Magnesium-26. Calculate the relative atomic mass of Magnesium, to two decimal places.
   
   Answer: [blank_start]24.32[blank_end]

   1. A24.32
5. 5Element A occurs naturally in the environment. Scientists have found 612 atoms of A-15, 829 atoms of A-16, and 244 atoms of A-17. Calculate the relative atomic mass of the element A to two decimal places.
   
   Answer: [blank_start]15.78[blank_end]

   1. A15.78
6. 6Atoms that have the same number of protons and a different number of neutrons are called:

   1. ARadioactive
   2. BElectrons
   3. CIons
   4. DIsotopes
7. 7Isotopes differ in __________, not atomic number

   1. AVolume
   2. BMass
   3. CDensity
8. 8The mass number of an atom can be approximated by calculating the sum of:

   1. AThe electrons and protons
   2. BThe protons and neutrons
   3. CThe neutrons and electrons
9. 9How many neutrons are in potassium-40?

   1. A19
   2. B40
   3. C21
   4. D37
10. 10How many protons are in Cr-52?

    1. A52
    2. B40
    3. C24

11. 11Which isotope of chlorine has 24 neutrons?

    1. AChlorine-17
    2. BChlorine-24
    3. CChlorine-7
    4. DChlorine-41
12. 12How many protons are in potassium-40?

    1. A18
    2. B19
    3. C40
    4. D21
13. 13Which of the following is not an isotope of Carbon?

    1. ACarbon-9
    2. BAn atom with 6 protons and 7 neutrons
    3. CAn atom with 7 protons and 6 neutrons
    4. DCarbon-23
14. 14Given the natural abundance of the isotopes of carbon, which are Carbon-12, Carbon-13 and Carbon-14, what is the relative atomic mass of naturally occurring carbon?

    1. A13.0107
    2. B12
    3. C13
    4. D12.0107
15. 15The following rule:
    [(mass isotope A (%) /100) + mass isotope B (%) / 100) + … mass isotope Y (%) / 100)]
    
    is used to calculate...

    1. AAtomic mass
    2. BIsotope Abundance
    3. CRelative Atomic mass
    4. DIsotope number

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There are 5 questions in this quiz. You may need calculator.

Author

mohamad denise hj rahim

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