Question

3.
Mendeleev left the gap under
aluminium and a gap under silicon
having atomic weights 68 and 72
respectively. These elements
respectively are .......
(a) Eka-aluminium and Eka-silicon
(b) aluminium and silicon
(c) Eka-germanium and Eka-silicon
(d) Eka-aluminium and
Eka-germanium​

Answer 1

Answer:

Option-a)

Eka-aluminium and Eka-silicon

Explanation:

Eka-aluminium-

1) Gallium(Ga) is a chemical element with atomic number 31.

2)The Solid gallium is of blue-gray metal having orthorhombic crystalline structure whereas a very pure gallium is coated with stunning silvery color.

3) It does not exist in pure form in nature, and its compounds do not act as a primary source of extraction.

Eka-silicon-

1) Germanium(Ge) is a chemical element places between silicon and tin in Group 14 of the periodic table.

2)A hard, grey-white, lustrous and brittle metalloid acts in properties between metals and nonmetals.

3)Germanium has a diamond-like structure and its properties are very similar to the physical and chemical properties of silicon.

FINAL ANSWER - Eka-aluminium and Eka-silicon

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