Which one of the following alkali metals has lowest melting point?
Which one of the following does not increase while moving down the group of the periodic table?
Arrange the following elements in the order of their increasing nonmetallic characterLi, O, C, Be, F
Arrange the following elements in the order of their decreasing metallic characterNa, Si, Cl, Mg, Al
Which of the following gives the correct increasing order of the atomic radii of O, F and N?
Which one of the following elements exhibit maximum number of valence electrons?
The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair of elements belong to the same group?
According to Mendeleev's Periodic Law, the elements were arranged in the periodic table in the order of
Upto which element, the Law of Octaves was found to be applicable