Question

(a) State Mendeleev’s periodic law.
(b) What chemical properties of elements were used by Mendeleev in creating his periodic table ?
(c) State any three limitations of Mendeleev’s classification of elements.
(d) Besides gallium, which two other elements have since been discovered for which Mendeleev had left gaps in his periodic table ?
(e) Which group of elements was missing from Mendeleev’s original periodic table ?

Lakhmir Singh Chemistry Class 10

Answer 1

hope it helps to you

Answer 2

(d) Scandium and Germanium