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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?
Asked by Topperlearning User | 13 Jul, 2015, 03:02: PM
answered-by-expert Expert Answer

(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.

Answered by | 13 Jul, 2015, 05:02: PM

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