MCQ
The first four $I.E.$ values of an element are $284, 412, 656$ and $3210\, k.J\, mol^{-1}.$ The number of valence electrons in the element are
- A$1$
- B$2$
- ✓$3$
- D$4$
✓
Answer
Correct option: C.
$3$
c
Considering the first four I.E values. of elements, the $I.E._4$ value of element is high and the difference between $I.E._3$ and $I.E._4$ is very High.
Considering the first four I.E values. of elements, the $I.E._4$ value of element is high and the difference between $I.E._3$ and $I.E._4$ is very High.
$I \cdot E_2-I E_1=412-284=128 \cdot kJ / mol$
$I \cdot E_3-I \cdot E_2=654-412=242 kJ / mol$
$I \cdot E_4-I \cdot E_3=3210-656=2554 kJ / mol$.
The avalue of $2554\,kJ/mol$ is the differeace between $I-E_4$ and $I-E_3$ suggest that the element is not able to loose its electron After loosing the three election. i.e the element will become stable on loss of three electrons.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Glass is a
The compound whose $0.1 \,M$ solution is basic is
→Internal energy does not include :
At $-20^{\circ} \mathrm{C}$ and $1 \mathrm{~atm}$ pressure, a cylinder is filled with equal number of $\mathrm{H}_2 . \mathrm{I}_2$ and $\mathrm{HI}$ molecules for the reaction
→$\mathrm{H}_2(\mathrm{~g})+\mathrm{I}_2(\mathrm{~g}) \rightleftharpoons 2 \mathrm{HI}(\mathrm{g})$, the $\mathrm{K}_{\mathrm{p}}$ for the process is $\mathrm{x} \times 10^{-1} \cdot \mathrm{x}=$ $\qquad$
[Given : $\mathrm{R}=0.082 \mathrm{~L} \mathrm{~atm} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}$ ]
Which of the following is not a general characteristic of equilibria involving physical processes?
Which of the following ionic radius would be maximum
At a certain temperature, only $50\%$ $HI$ is dissociated into $H_2$ and $I_2$ at equilibrium. The equilibrium constant is
→Which one of the following statements about the zeolites is false
$Y$ is
→What is the molar solubility of $Ag_2CO_3\, (K_{sp} = 4 \times 10^{-13})$ in $0.1\, M\, Na_2CO_3$ solution ?
→