Question

explain mendellev prediction for the element eka ammonium (gallium) and eka-silicon that is( Germanium)..​

Answer 1

Answer:

1. Mendeleev was the first who put forth the periodic table
2. He put forth all known elememts.known at that time in increasing order of their atomic masses
3. He predicted about some elements in future times which were found to be correct
4. He also predicted about the chemical and physical properties of element and also their atomic mass and atomic number
5. These are the predicted elements :
6. Mendeleev's Predicted Elements

Eka-boron (scandium)

Eka-aluminium (gallium)

Eka-manganese (technetium)

Eka-silicon (germanium

7. Germanium was one of the elements whose existence was predicted in 1869 by Russian chemist Dmitri Mendeleev, after he noticed a gap between silicon and tin in his periodic table. ... Mendeleev had predicted the new element's density would be 5.5 g/cm3 and its atomic weight would be 70

8. Scandium metal is a silvery-white solid with a slight pink or yellow tint when exposed to air. It has a melting point of 1,538°C (2,800°F) and a boiling point of about 2,700°C (4,900°F). Its density is 2.99 grams per cubic centimeter.

9. Gallium is a silvery, glass-like, soft metal. It sits close to the non-metals in the periodic table and its metallic properties aren't as obviously metallic as most other metals. Solid gallium is brittle and is a poorer electrical conductor than lead.

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Answer 2

Answer:

Based on other elements in the same group he predicted the existence of eka-aluminum, eka-boron, and eka-silicon, later to be named gallium (Ga), scandium (Sc), and germanium (Ge). Mendeleev predicted the atomic mass of each element along with compounds they each should form.