1.

(a) In Mendeleev’s periodic table, a gap was not left for one of the following elements. This element is : (a) gallium (b) beryllium (c) germanium (d) scandium

Answer»

(a) In Mendeleev’s periodic table, a gap was not left for one of the following elements. This element is :

(a) gallium (b) beryllium (c) germanium (d) scandium



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