In hydrogen atom, an electron is transferred from an orbit of radius 1.3225 nm to another orbit of radius 0.2116 nm . What is the energy (in J ) of emitted radiation?
Identify the correct orders regarding atomic radii
(i) $\mathrm{Cl}>\mathrm{F}>\mathrm{Li}$
(ii) $\mathrm{P}>\mathrm{C}>\mathrm{N}$
(iii) $\mathrm{Tm}>\mathrm{Sm}>\mathrm{Eu}$
(iv) $\mathrm{Sr}>\mathrm{Ca}>\mathrm{Mg}$
$$ \text { Match the following } $$
$$ \begin{array}{cccc} \hline & \text { List-I (Elements) } & & \text { List-II (Group) } \\ \hline \text { A } & \mathrm{Mn}, \mathrm{Tc}, \mathrm{Re} & \text { I } & 12 \\ \hline \text { B } & \mathrm{Zn}, \mathrm{Cd}, \mathrm{Hg} & \text { II } & 4 \\ \hline \text { C } & \mathrm{Ti}, \mathrm{Zr}, \mathrm{Hf} & \text { III } & 17 \\ \hline \text { D } & \mathrm{Ga}, \mathrm{In}, \mathrm{Tl} & \text { IV } & 7 \\ \hline & & \text { V } & 13 \\ \hline \end{array} $$
The correct answer is
The atomic numbers of the elements $X, Y, Z$ are $a, a+1, a+2$ respectively. $Z$ is an alkali metal. The nature of bonding in the compound formed by $X$ and $Z$ is
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