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2 April, 11:36

chlorine has an average atomic mass of 35.45 amu. the two naturally occurring isotopes of chlorine are clorine-35 and chlorne - 37 why doesthis idicate that most clorine atoms contain 18 neutrons

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  1. 2 April, 14:45
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    See below.

    Step-by-step explanation:

    The two isotopes are Cl-35 and Cl-37.

    The average atomic mass (35.45 u) is closer to 35 u, so most of the atoms are Cl-35.

    mass number = number of protons + number of neutrons

    A = p + n

    35 = 17 + n

    n = 35 - 17

    n = 18

    ∴ Most chlorine atoms contain 18 neutrons.
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