Question

Mendeleev’s eka-aluminium is:
A. scandium
B. gallium
C. germanium
D. indium

Answer 1

Hint: To know the upgraded actual name of eka-aluminium, we should go through the periodic table of Mendeleev’s. The eka-aluminium is in group 13 of his periodic table. And then we will also discuss more about that element.

Complete step by step answer:
Mendeleev predicted the properties of some of the elements during the classification which were not yet discovered. He named one of the elements as eka-aluminium which was later discovered as Gallium.
Gallium is a chemical element with the symbol $Ga$ and atomic number 31. Elemental gallium is a soft, silvery metal at standard temperature and pressure; however in its liquid state it becomes silvery white. It is in group 13 of the periodic table, and thus has similarities to the other metals of the group, aluminium, indium, and thallium.
Gallium doesn't happen as a free component in nature, yet as gallium (III) compounds in follow sums in zinc metals and in bauxite. Natural gallium is a fluid at temperatures more prominent than \[29.76{\text{ }}^\circ C{\text{ }}\left( {85.57{\text{ }}^\circ F} \right)\] and will dissolve in an individual's hands at typical human internal heat level of \[37.0{\text{ }}^\circ C{\text{ }}\left( {98.6{\text{ }}^\circ F} \right)\] .

So, the correct answer is Option B.

Note: Gallium is a soft, silvery metal used primarily in electronic circuits, semiconductors and light-emitting diodes (LEDs). It is also useful in high-temperature thermometers, barometers, pharmaceuticals and nuclear medicine tests. The element has no known biological value.