Anonymous
Anonymous asked in Science & MathematicsChemistry · 6 years ago

If an atom has an atomic number of 9 and an atomic mass number of 19. How many protons, neutrons, and electron?

If an atom has an atomic number of 9 and an atomic mass number of 19. How many protons, neutrons, and electrons does it have?

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  • 6 years ago
    Best Answer

    Atomic number = number of protons = 9

    Atomic mass = number of protons + number of neutrons, number of neutrons = Atomic mass - atomic number = 19 - 9 = 10

    Number of electrons in neutral atom = number of protons = atomic number = 9

  • 3 years ago

    Atomic Number 9

  • Anonymous
    6 years ago

    In a neutral atom,atomic number always equal to number of electrons and number protons.And mass number equal to sum of number protons and neutrons.

    So there are 9 electrons,9 protons and 10 neutrons.

    In a neutral atom,

    Atomic number =no of protons =number of electrons

    Mass number= number of protons + number of neutrons

  • 6 years ago

    9=electrons

    9=protons

    10=neutrons

    Your talking about Fluorine.

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  • 6 years ago

    number of electrons = number of protons = atomic number = 9

    atomic mass =protons+ neutrons = e- + neutrons

    so neutrons = A.M - e- = 19 - 9 = 10

    the element is FLUORINE [ F ]

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