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Which of the following periods is the shortest one?
A
1
B
3
C
2
D
4
Explanation
The first period is known as the shortest period among the seven periods of the periodic table this is because it contains only two elements; one of the two elements is hydrogen and the other is the Helium.
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Which of the following sets of elements belong to the same period?
NextFor a given shell, the screening effect of d-electrons is:
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