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18 June, 16:09

Which isotope has the greatest number of protons?

A Pa-238

B U-240

C Np-238

D Pu-239

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Answers (1)
  1. 18 June, 16:28
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    The isotope with the greatest number of protons is:

    option D: Pu-239, with 94 protons

    Explanation:

    The number of protons is the atomic number and is a unique number for each type of element.

    You can tell the number of protons searching the element in a periodic table and reading its atomic number.

    Thus, this is how you tell the number of protons or each isotope

    Sample Chemical symbol Element atomic number # of protons

    A Pa-238 Pa protactinium 91 91

    B U-240 U uranium 92 92

    C Np-238 Np neptunium 93 93

    D Pu-239 Pu plutonium 94 94
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