Mendeleev predicted the existence of certain elements not known at that time and named two of them as eka-aluminium and eka-silicon. Swati has been given an assignment in the class on Mendeleev's periodic table. She has to answer the following questions in the assignment:
(i) Name the element which has taken the place of (a) eka-aluminium (b) eka-silicon
(ii) Mention the period/periods of these elements in the modern periodic table.
(iii) Write the group/groups of these elements in the modern periodic table.
(iv) Classify these elements as metals, non-metals or metalloids.
(v) How has the classification of elements according to modern periodic table helped in making the study of chemistry easy?
(i) (a) Gallium (b) Germanium.
(ii) 4th period.
(iii) Gallium: 13th group; Germanium: 14th group.
(iv) Gallium: Metal; Germanium: Metalloid.
(v) In the periodic table, all the elements have been divided into a few groups of elements. It is much more convenient to study the properties of a few elements of each group than to study the properties of all the elements separately.
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