n 36. a. protons b. neutrons the discovery of C. electrons d. nucleus 037. In which of the following pairs of shells that energy difference between two adjacent orbits is minimum? a. K, L b. L, M C. M, N d. N, O A 38. Assertion A: An electron in the inner orbit is more tightly bound to the nucleus. Reason B: The greater the absolute value of the energy of an electron, the more tightly the electron is bound to the nucleus. a. b. C. Both A and B are true but B is not the appropriate reason for A. Both A and B are individually correct and B is the correct reason for A. A is correct but B is not correct. d. Both A and B are not correct. 39. If two naturally occurring isotopes of an element are 1x and 1x what is the percentage composition of each isotope of X occurring respectively if the average atomic weight accounts for 14? a. 95,5 b. 80, 20 75,25 c. d. 65, 35 A 40. An element has two isotopes with mass numbers 16 and 18. The average atomic weight is 16.5. The percentage abundance of these isotopes is and respectively. a. 75, 25 mic b. 25,75 C. 50,50 d. 33.33, 66.67 llowing are isobars?​