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