Which of the given elements A, B, C, D and E with atomic number 2, 3, 7, 10 and 30 respectively belong to the same period?
A. A, B, C
B. B, C, D
C. A, D, E
D. B, D, E
This period contains the elements beryllium, boron, carbon, oxygen and fluorine.
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Account for the following:
a. Cations are smaller in size than the corresponding atom.
b. The noble gases were discovered very late.Xam idea - Science
Why are isotopes of an element having different atomic masses placed at the same position in the periodic Table?Xam idea - Science