Practice Test | Kullabs.com
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  • The atomic number of ______  is 6 and its mass is 13

    calcium
    boron
    lithium
    carbon
  • An element has an atomic number 19 the electronic configuration of that element is ______.

    2,8,7,2
    2,8,8,2
    2,8,9
    2,8,8,1
  • The mass number of an element is 16 and number of neutrons is 7. The number of electrons is ______.

    8
    7
    10
    9
  • Which one is true?

    Atomic mass number = No. of protons x No. of neutrons
    Atomic mass number = Atomic number - Neutron number
    none of the above
    Atomic mass number = Atomic number + Neutron number
  • One atom of sodium element has ______.

    9 proton
    5 atoms
    11 proton
    15 proton
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