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30 May, 12:58

Why atomic mass is an average vàlue

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Answers (2)
  1. 30 May, 13:19
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    The atomic mass is the average number of protons and neutrons for all natural isotopes of an element. It is a decimal number.

    Explanation:

    Atomic Mass and Mass Number Example:

    Hydrogen has three natural isotopes: 1H, 2H, and 3H. Each isotope has a different mass number.

    1H has 1 proton. Its mass number is 1. 2H has 1 proton and 1 neutron. Its mass number is 2. 3H has 1 proton and 2 neutrons. Its mass number is 3. 99.98% of all hydrogen is 1H 0.018% of all hydrogen is 2H 0.002% of all hydrogen is 3H Together, they give a value of atomic mass of hydrogen equal to 1.0079 g/mol.
  2. 30 May, 13:22
    0
    There are different isotopes for different elements

    Explanation:

    The mass of each of the isotopes of an element are added with their percentage each then they are divided by 100

    Example boron 11 is 80 % boron 10 is 20%

    Total mass of boron 10 is 20*10

    Total mass of boron 11 is 80*11

    Atomic mass is (20*10) + (80*11) / 100

    Which is 10.8 and it is rounded off as 11 in the periodic table
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