Question
A modern periodic table consists of ________groups and
_________periods, respectively.Solution
In the long form of the periodic table there are 7 horizontal rows called periods and 18 vertical columns called groups .
Complete the series choosing the missing number.
8, 13, 20, ____, 40.
0.5 1.5 5 ? 76 385
...Given below are two numbers series 'I' and 'II' and each series has a wrong (odd one out) number. The number that should come in place of the wrong num...
21     84      168      172     ?     348
...9 15 90 95 475 479
6 a b c d e
Find the value of c.
...35    57    101    189    ?     717
100Â Â Â 180Â Â Â 294Â Â Â 448Â Â Â 648Â Â Â ?
18 113 559 2247 6721 13451
...20Â Â Â 60Â Â Â Â 150Â Â Â Â 300Â Â Â 450Â Â Â ?
Select the number from among the given options that can replace the question mark (?) in the following series.
2, 6, 12, 20, ?, ?
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