Practice Test | Kullabs.com
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  • Almost the entire mass of an atom is concentrated in the ______ .

    Nucleus
    Electrons
    Neutrons
    Protons
  • The mass of the atom is determined by ______ .

    Electron and Neutron
    Neutron and Proton
    Electrons
    Neutrons
  • The fixed circular paths around the nucleus are called ______ .

    Orbits
    Neuclons
    Orbitals
    Mesons
  • The sum of number of protons and neutrons present in the nucleus of an atom is called ______.

    Atomic number
    Atomic weight
    Atomic mass
    None of these
  • An atom is made of all these things except ______.

    Proton
    Electron
    Nucleus
    Neutron
  • Which one of the following is the negatively charged particle in an atom ______.

    Proton
    Neutron
    Electron
    Neutrino
  • An atom is a neutral particle because ______ .

    Charge of electron, proton and neutron cancel each other.
    Charge of electron and proton cancel each other.
    Proton is inside nucleus and electron is outside.
    Neutron cancel the interaction of proton and neutron.
  • Which of the following lack neutron?

    Hydrogen atom
    Lithium atom
    Helium atom
    Boron atom
  • Which of the following is true for a neutral atom?

    Atomic number = no of proton = no of electrons
    Atomic number = atomic mass no of neutrons
    Atomic number = no of electrons
    All of the answers are true
  • Electrons are arranged outside of the atom called ______ .

    All of the above
    Probability diagram
    Shell
    Electron cloud
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