In hydrogen atom, the minimum energy required to excite an electron from 2nd orbit to the 3rd orbit is
The velocity $(v)$ of de-Broglie wave is given by
$$ \left[\begin{array}{l} v=\text { frequency } \\ m=\text { mass } \\ C=\text { velocity } \text { of } \text { light } \end{array}\right] $$
How many of the following statements are correct?
(A) ' $\mathrm{He}^{\prime}$ ' is the second most abundant element in the universe.
(B) The symbol for the element with atomic number 110 is Ds.
(C) Osmium has the highest density among all elements.
(D) Francium is the most electropositive element in the periodic table.
The correct order of the first ionisation enthalpies of the following elements is
TS EAMCET Papers
All year-wise previous year question papers