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Achievements of Mendeleev's Periodic Table

In Mendeleev'...

Question

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

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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. (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?

On the basis of Mendeleev's Periodic Table given below, answer the question that follow the table:

Besides gallium, which two other elements have since been discovered for which Mendeleev had left gaps in his Periodic Table? Using atomic masses of

Li,NaLi,Na, find the average atomic mass of and compare it with the atomic mass of. State the conclusion drawn from this activity.

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