1. The size of the nucleus is approximately _______.
2. Cathode rays are a ray of ____.
3. Which of the following is a polar molecule?
4. Which of the following is NOT positively charged?
5. Electron was discovered in the year 1897 by___
6. All isotopes of the same element have --------?
7. Which of the following statement is not correct with respect to Rutherford's atomic model?
8. Which among the following is present inside the nucleus of an atom?
9. Chemical properties of isotopes ............ ?
10. Barium loses………. electrons to achieve noble gas electronic configuration?
11. Which among the following is false about alpha particles?
12. Who discovered the neutron and its properties?
13. In 1904 who discovered plum-pudding model of atom, according to which positive charge is spread over a sphere and electrons are embedded to the positive charge as resins are scattered in plum-pudding?
14. Atoms of which of the following elements has more than one electron in its outermost shell?
15. Which of the following property of a proton cannot change while it moves freely in magnetic field?
16. Which of the following particles were made to fall on a thin gold foil by Ernest Rutherford?
17. Electrons move around the nucleus in..........…. motion.
18. Which of the following pair of number composition is/are correct?
I. Atomic Number – Number of Proton
II. Mass number – Sum of numbers of neutron and proton
19. Which of the following is not an isotope of the element hydrogen?
20. The existence of isotopes was first suggested in 1913 by the radiochemist .........
21. How many protons are there in a lithium nucleus?
22. Atomic number of an atom gives the number of which of the following?
23. Fe has 26 protons in its nucleus. What are the number of electrons in Fe²⁺ (II) ion?
24. Which of the following represents an alpha particle?
25. What happens when one s and one p orbital is hybridized?
26. The general electronic configuration ns² np³ fits which of the following elements?
27. How many types of isotopes does Scandium have?
28. The mass of proton and mass of ………is same.
29. Protium, deuterium and tritium are the naturally occurring isotopes of:
30. The antiparticle of an electron is?
31. The existence of isotopes was first suggested in 1913 by the radiochemist .........?
32. There are stable, negatively charged particles found in all atoms?
33. Which of the following is false?
34. In the context of isotopes of any element, which of the following statements is not correct?
35. How many maximum electrons can be present in third or M-shell?
36. When did Rutherford published results of gold-foil experiment through which it was noticed that scattering becomes due to presence of rigid core inside nucleus of the atom?
37. The number of protons in a Lithium nucleus is:
38. The mass of an electron is nearly one upon _______ times that of a proton.
39. In any shell the difference between two electron to be done by?
40. What is the atomic mass of oxygen (expressed in ‘u’)?
41. What is the atomic mass of oxygen (Which is represented in 'u')?
42. What is the atomic number of nitrogen?
43. The first electron shell which is the nearest to the nucleus never holds more than 'n' electrons, where 'n' is equal to:
44. What is the difference between two electrons in an orbit?
45. Neutrons are present in the nucleus of all atoms EXCEPT in those of _____.
46. How many protons are found in nucleus of Lithium?
47. Atoms of same element having different mass numbers are called…………. ?
48. What is the atomic number of chromium?
49. What is atomic mass of nitrogen atom?
50. Which of the following scientists discovered the electron in 1897?
