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

    Protons
    Nucleus
    Neutrons
    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 ______ .

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

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

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

    Neutron
    Proton
    Electron
    Neutrino
  • 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?

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

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

    Shell
    Probability diagram
    Electron cloud
    All of the above
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