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20 October, 15:25

A neutral isotope has 45 neutrons and 36 electrons. Identify the element symbol of this isotope and determine the mass number and number of protons. element symbol: mass number: number of protons:

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  1. 20 October, 15:28
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    Kr, mass number 81, number protons 36.

    Explanation:

    If the atom has 36 electrons, and it is neutral, it has 36 protons. 36 protons means that this element has atomic number = 36. This is Kr.

    Mass number = number protons + number neutrons = 36 + 45 = 81
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