Weekly assessment of chemistry (Class VIII)

1. The nucleus of an atom consist of. Electron and proton Proton and neutrons Electrons and neutron 2. Which is the the lightest particle: Electron Proton Neutron 3. Which particle is heavier then other. Electron Proton Neutron 4. Mass of electron is: 9.11 x 10-26 9.11 x 10-27 9.11 x 10-31 5. The mass of proton is: 1.67 x 10-22 1.67 x 10-23 1.67 x 10-27 6. Charge on electron is: 1.602x10-19 1.602x10-16 1.602x10-12 7. The number of isotopes of hydrogen is: 3 4 5 8. Atomic number of sodium (Na) is: 11 12 13 9. Electron have _ charge. Positive Negative Neutral 10. The smallest part of element is _ Electron atom Neutron