The noble gas which is used in the treatment of cancer is Radon. The atomic number of Radon is 86 and is an element of the 6th period. It is a radioactive, odourless and tasteless noble gas. It is represented by Rn.
61, 48, ?, 35, 87, 22
20 25 54 165 662 ?
...17 ? 2142 12852 64260 257040
...31 35 60 124 ? 441
...? 12 24 44 74 116
...64 48 36 22 16 8
25 13.5 12.5 20.75 39.5 ? 302.25
...6 10 ? 210 1672 16710
...Direction: Which of the following will replace ‘?’ in the given question?
2, ‘?’, 46, 136, 311, 605, 1086
12 23 65 ? 1239 7409
...
