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Topic 3, (n) shell, fe) orbital, 4. Eloctrons are filled into different orbitals and this, distribution of electrons into orbitals of an atoms is, mber (n) define (s) the main energy level termed as, (b) subshell, (d) None of these, 31. Which of the following statements is incorrect?, (a) The 4th period in the periodic table ends at krypton with, she filling up of the 3p-orbitals, th(b) The 5th period in the periodic table contains the, 4d-transition series, (c) Starting element of 4d-transition series is yttrium, (d) Filling up of the 4/-orbitals begins with cerium, 32. 4/ inner-transition series and 5f inner-transition series, of elements are termed as, respectively, (a) actinoid and 3d- series, (b) lanthanoid and actinoid series, (c) cerium and 3d- series, (d) None of the above, termed as, (b) electronic configuration, (d) None of these, (a) shell, (c) Both (a) and (b), 95. Which of following statements regarding the, configuration of elements in a periodic table is/are, true?, (a) The period indicates the value of n for the valence, shell, (b) The number of elements prescnt in each period is twice, the number of atomic orbitals available in the energy, level that is being filled, (c) First period starts with filling of the lowest level, (d) All of the above, 33. All of the group-I clements have ns' valence shell, electronic configuration and the propertics of an, element have, (a) periodic dependence upon its atomic mass, (b) periodic dependence upon its atomic number, (e) periodic dependence upon its atomic radius, (d) None of the above, 26. An element A belongs to third period and fifteenth, group of the pcriodic table. Which one of the, following is true regarding the outer electronic, configuration of A?, (a) It has completely Gilled s-orbital und p-orbital, (b) It has partially filled d-orbitals and completely filled, 9-orbital, 34. The clements in a vertical column exhibit similar, chemical behaviour. This is because, (a) these elements bave the same number of electrons in their, outermost orbitals, (b) these elements have the different number of electrons in, their outermost orbitals, (c) these elements have no electrons in their outermost, orbitals, (d) None of the above, (c) It has half-filled d-orbituls and completely filled, -orbitals, (d) It has completely filled s-orbital and half-filled p-orbitals, 27. The number of elements in second period of the, periodic table is, (a) 2, 35. Elements are classified into four blocks like 3-block,, p-block, d-block and f-block on the basis of, (a) utomic number, (b) atomic mass, (b) 6, (e) 8, (d) 18, (c) atomic orbitals, (d) All of the above, 28. Successive filling of 3s and 3p orbitals give rise to the, third period. The number of clements present in this to, period are, (a) 2, 36. Out of the four blocks in which periodic table is, divided, helium belongs which block?, (b) p-block, (d) fblock, (b) 4, (c) 6, (d) 8, (a) s-block, 29. 3d-transition series of elements starts with scandium, which has the electronic configuration, (a) 3d' 4s, (c) d-block, 37. ns and ns outermost electronic configuration of, s-block elements. They are all reactive metals w, (a) high ionisation enthalpies, (b) low ionisation enthalpies, (c) larger principal quantum number, (d) None of the above, (b) 3d' 4s (e) 3d 4s (d) 3d' 4s?, 30. The 3d-orbitals are filled at zinc with electronic, configuration of, (a) [Ar] 3d 4, (c) [Ar] 3d" 4s, (b) [Ar] 3d" 4s, (d) [Ar] 3d"4s