Question

Compare the properties of germanium with the properties of eka-silicon predicted by Mendeleev

Answer 1

1. Mendeleev was predicting the properties of three elements – gallium, scandium, and germanium – that had not then been discovered.
2. Mendeleev named elements as EKA- Boron EKA- Aluminium and EKA Silicon which were later replaced as Scandium, Gallium, and germanium respectively
3. Mendeleev named one such element gap Eka silicon. Based on its periodic table position, he predicted its mass, density, melting point, and color.
4. A new element named Germanium was discovered in Germany fifteen years after this prediction. Its properties were identical to those of Eka silicon.

Eka silicon	Germanium
4 electrons in the valance shell	4 electrons in the valance shell
Ekasilicon has an atomic mass of about 73 u	The atomic mass of Germanium is 72.64 u
Density (g/cm3) 5.5	Density (g/cm3) 5.323
Melting point high	Melting point high 937.4 0C
Color grey	color silvery grey
Stable	Stable