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Achievements of Mendeleev's Periodic Table

a In Mendelee...

Question

(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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Solution

(b) Beryllium.

In Mendeleev's periodic table, a gap was left for gallium, scandium and germanium.

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Q. In Mendeleev's periodic table, gap was not left for one of the following elements. This element is:

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

Q. (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?

Q. (a) How do the properties of eka-aluminium element predicted by Mendeleev compare with the actual properties of gallium element? Expalin your answer.
(b) What names were given by Mendeleev to the then undiscovered elements (i) scandium (ii) gallium, and (iii) germanium?

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