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18 September, 01:29

The information below refers to six isotopes. How many elements are represented in this group of isotopes? Atomic number Mass number

19 39

6 13

6 12

19 41

82 207

82 206

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Answers (1)
  1. 18 September, 01:40
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    There are 3 elements (6; 12) (19; 39) and (82; 207)

    There are 3 isotopes (6; 13) (19; 41) and (82; 206)

    Explanation:

    Step 1:

    Isotopes have the same atomic number but a different mass number

    The element with number 19 is Potassium

    Potassium has a mass number of 39 g/mol

    This is the element potassium and is not an element

    41C has mass number of 41 g/mol and is an isotope

    The element with number 6 is carbon

    Carbon has a mass number of 12 g/mol

    13C has a mass number of 13 g/mol and is an isotope

    The element with number 82 is lead

    Lead has a mass number of 207 g/mol

    206Pb has a mass number of 206 g/mol and is an isotope

    There are 3 elements (6; 12) (19; 39) and (82; 207)

    There are 3 isotopes (6; 13) (19; 41) and (82; 206)
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