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

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

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

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

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

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

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

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

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

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

    All of the above
    Probability diagram
    Electron cloud
    Shell
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