An element `X` forms an oxide `X_(2)O_(3)`. In which group of Mendeleev's periodic table is this element placed?

If an element X forms an oxide X_(2)O_(3) , then find the group in Mendeleev's periodic table where it is placed

How did mendeleev's periodic table help in the discovery of new elements?

Formulas of oxide and chloride of an element A are A_(2)O_(5) and AC l_(3) respectively. Which group of the mendeleev's periodic table will the element belong to? State whetehr it is a metal or a non-metal.

In Mendeleev's periodic table group VIII contains________elements.

The bridge elements in Mendeleev's periodic table are

The anomalous series of elements of mendeleev's periodic table is

Name the elements discovered after mendeleev's periodic table?