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The MCQ: Both elements of 1st period contain valence electrons in "Periodic Table" App Download [Free] with answers: m shell, n shell, k shell, and s shell to study online courses. Solve Periodic Table and Periodicity Quiz Questions, download Apple Book (Free Sample) for distance learning classes.
Both elements of 1st period contain valence electrons in
In the periodic table, helium is placed at
The first three periods are
On basis of electronic configuration the group and period of 95B is
Nobel gases are present in
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