41. Which of the following groups has one electron in the outermost shell?
42. Elements in the modern Periodic Table are arranged in . . . . . . . . vertical columns.
43. What are the elements with lanthanum in group 3, period 6 called?
44. The ionisation potential of nitrogen is
45. Which of the following atoms has the highest diameter?
46. What are transition elements?
47. The element with atomic number 56 belongs to which block?
48. Which of the following atomic numbers have a pair of elements belonging to the same group?
49. The atomic radius is used to measure the size of . . . . . . . .
50. The chemistry of lithium is very similar to that of magnesium even though they are placed in different groups. The reason is
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