Match the following elements from Mendeleev's periodic table to their names in the modern periodic table.

Gallium

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Scandium

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Germanium

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Solution

Mendeleev predicted that the properties of the three unknown elements namely eka-boron, eka-aluminium and eka-silicon were similar to that of boron, aluminium and silicon. These elements were later discovered and named as scandium, gallium and germanium respectively.

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Name two elements whose atomic weights are corrected on the basis of their positions in the Mendeleev periodic table.

Q. Match the following elements from Mendeleev's periodic table to their names in the modern periodic table.

state the periodic law in which mendeleev s periodic table was based .why was this periodic law changed ? name two elements whose properties were predicted on the basis of their position in mendeleevs periodic table.

Q. Which of the following element(s) in the modern periodic table resemble elements predicted by Mendeleev?

(More than one option is correct)

Which of the following statement (s) about the Modern Periodic Table are incorrect

(i) The elements in the Modern Periodic Table are arranged based on their decreasing atomic number.

(ii) The elements in the Modern Periodic Table are arranged based on their increasing atomic masses.

(iii) Isotopes are placed in an adjoining group (s) in the Periodic Table.

(iv) The elements in the Modern Periodic Table are arranged based on their increasing atomic number.

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