Which of following statements regarding the configuration of elements in a periodic table is/are true?
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a
The period indicates the value of n for the valence shell
b
The number of elements present in each period is twice the number of atomic orbitals available in the energy level that is being filled
c
First period starts with filling of the lowest level
d
All of the above
answer is D.
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Detailed Solution
The period indicates the value of n for the outermost or valence shell.The number of elements present in each period is twice the number of atomic orbitals available in the energy level that is being filled.First period (n = 1) starts with the filling of the lowest level (1s) and therefore has two elements-hydrogen (1s1) and helium (1s2).