Structure of the atom Worksheet-10

Structure of the atom Worksheet-10

 

  1. J.J. Thomson proposed that the nucleus of an atom contains only nucleons.

 

  1. A neutron is formed by an electron and proton combining together. Therefore, it is neutral.

 

  1. The mass of an electron is about 1/2000 times that of proton.

 

  1. An isotope of iodine is used for making tincture of iodine, which is used as medicine.

 

  1. Alpha particles have twice the mass as that of protons.

 

  1. The atom as a whole is electrically neutral.

 

  1. The nucleus of the atom is light.

 

  1. Electrons in the extra nuclear portion are stationary.

 

  1. While revolving around the nucleus, the electrons do not radiate any energy.

 

  1. Chemical properties of an element depend upon mass numbers and not atomic numbers.

 

  1. Isotopes of an element are chemically similar.

 

  1. In an neutral atom, the atomic number is equal to the number of electrons.

 

  1. All isotopes of an element are of radioactive nature.

 

  1. The valence shell of an atom can have any number of electrons.

 

  1. The valency of an element with configuration 2 and 7 is 1.

 

Answer:

  1. False

  2. False

  3. True

  4. False

  5. False

  6. True

  7. False

  8. False

  9. True

  10. False

  11. True

  12. True

  13. False

  14. False

  15. True