Question
Which radioactive element with atomic number 43 in the
modern periodic table is unstable, and the half-lives of all its isotopes are relatively short, from 4.2 million years to 5.0 s?Solution
The correct answer is D
More Previous Year Paper Questions
Find the wrong number in the given number series.
7, 8, 17, 42, 83, 172- Find the wrong number in the given number series.
8, 16, 32, 70, 128, 256 - Find the wrong number, in the given number series.
320, 160, 80, 50, 20, 10 24, 41, 58, 75, 94, 109
32, 46, 88, 158, 256, 380
Find the wrong term in the given series below.
1024, 130, 34.5, 19.25, 21.5, 44.55
19, 20, 39, 59, 98, 156, 255
6, 22, 76, 314, 1580, 9600
72, 36, 54, 135, 470.5, 2126.25Â
- 2024, 1583, 1193, 822, 498, 209
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