Question
Why are alkali metals not found in nature?

Answer

​​​​Alkali metals include lithium, sodium, potassium, rubidium, cesium, and francium. These metals have only one electron in their valence shell, which they lose easily, owing to their low ionization energies. Therefore, alkali metals are highly reactive and are not found in nature in their elemental state.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Calculate $\Delta_\text{r}\text{H}^\circ$ for the reaction,
$\text{H}-\text{C}=\text{C}-\text{H}+30=0\overrightarrow{\ \ \ \ \ \ \ }\\ \ \ \ \ \ \ \ \ \ |\ \ \ \ \ \ \ |\\ \ \ \ \ \ \ \ \ \text{H} \ \ \ \ \ \text{H}\\20=\text{C}=0+2\text{H}-0-\text{H}$
The average bond enthalpies of various bonds are as follows.
Bond
Bond enthalpy ($\mathrm{kJ} \mathrm{~mol}^{-1}$)
C-H
414
O=O
499
C=O
724
O-H
460
C=C
619
Which quantity out of $\Delta_\text{r}\text{G}$ and $\Delta_\text{r}\text{G}^\ominus$ will be zero at equilibrium?
If density of liquid mercury is $1 3 . 6$ gram $c m ^{-3}$ then calculate number of moles in 1 liter of mercury. (Atomic mass of mercury $=200$ )
Name the indicator used in redox titration involving $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ as an oxidising agent.
The velocity associated with a proton moving in a potential difference of 1000 V is $4.37 \times 10^5 \mathrm{~ms}^{-1}$. If the hockey ball of mass 0.1 kg is moving with this velocity, calcualte the wavelength associated with this velocity.
The dissociation constant of HCOOH and $CH _3 COOH$ is $2 \times 10^{-4}$ and $1.8 \times 10^{-5}$ respectively then calculate the isohydric concentration of HCOOH with $0.03 N CH _3 COOH$.
At 523 K temperature following reaction $PCl _5(g) \rightleftharpoons PCl _3(g)+ Cl _2(g)$ value of $K _{ p }$ is 2.35 atm then calculate value of $K_c \cdot\left(R=0.082 L\right.$ atm degree ${ }^{-1}$ $mol ^{-1}$.
If the amount of ionization of 0.01 M aqueous solution of $NH _3$ is $2 \%$, then calculate its dissociation constant.
Classify the following pairs as position, chain, functional isomers or metamers:
  1. Diethylamine and Methylpropylamine.
  2. Ethanol and Dimethylether.
Arrange the elements with the following electronic configurations in order of increasing electron gain enthalpy.
i. $1 s^2 2 s^2 2 p^5$
ii. $1 s^2 2 s^2 2 p^4$
iii. $1 s^2 2 s^2 2 p^3$
iv. $1 s^2 2 s^2 2 p^6 3 s^2 3 p^4$