Lesson - 4
Q1. Maximum, how many electrons are held in N orbit of an atom?
Ans: 32 electrons.
Q2. What is the source of Alpha particles of Rutherford experiment?
Ans: Double charged Helium particle.
Q3. Name the non-atomic particle which does not take part in atomic mass.
Ans: Electrons.
Q4. Name the positive charged atomic particles which presence in nucleus.
Ans: Protons.
Q5. Copper has atomic number 29. Then what is its valency?
Ans: 1
Q6. Give the example of isobar?
Ans: Calcium, Argon
Q7. Name the scientist who proposed that the atom is as chrismas cake.
Ans: J. Thomson.
Q8. Name the scientist who discovered protons.
Ans: E Gold Steen.
Q9.
Q10. Name the isotope of hydrogen which has 2 atomic mass number.
Ans: Deuterium
Q11. Name the non-atomic particle which takes part in atomic mass and having no charge.
Ans: Neutron
Q12. Name the isotope of element which is used in treatment of goiter. – Iodine
Q13. Name the scientist who discovered the nucleus.
Ans: Rutherford
Q14.
Q15. Name the scientist who discovered the neutron.
Ans: J. Chadwick
Q16. Name the isotopes of element which is used in atomic reacter as fuel.
Ans: Uranium