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

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

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

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

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

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

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

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

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

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

    Shell
    Electron cloud
    All of the above
    Probability diagram
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