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24 April, 13:33

dentify the missing information for each atom or ion. Note that the atoms and ions are not necessarily neutral. A Se ion has a mass number of 78 and a charge of - 2. Determine the number of neutrons, protons, and electrons in this ion. number of neutrons: 44 number of protons: 34 number of electrons: 36 An ion has a mass number of 65, 36 neutrons, and a charge of + 1. Identify the element symbol, and determine the number of protons and electrons in this ion. element symbol: Cu number of protons: 30 number of electrons: 29 An atom or ion has 43 neutrons, 36 protons, and 36 electrons. Identify the element symbol, and determine the mass number and charge for this atom or ion. element symbol: Au mass number: 79 charge: 0

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  1. 24 April, 15:00
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    Check the explanation

    Explanation:

    1)

    Atomic number of Se = 34

    So, number of proton = 34

    use:

    charge = number of proton - number of electron

    -2 = 34 - number of electron

    number of electron = 36

    number of neutron = mass number - atomic number

    = 78 - 34

    = 44

    Answer:

    44

    34

    36

    2)

    number of proton = mass number - number of neutron

    = 65 - 36

    = 29

    29 is atomic number for Cu

    use:

    charge = number of proton - number of electron

    +1 = 29 - number of electron

    number of electron = 28

    Answer:

    Cu

    29

    28

    3)

    Atomic number is 36 for Kr

    use:

    charge = number of proton - number of electron

    = 36 - 36

    = 0

    use:

    mass number = number of proton + number of neutron

    = 36 + 42

    = 78

    Answer:

    Kr

    78

    0
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