Download App

Classification of Elements and Periodicity in Properties — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryClassification of Elements and Periodicity in Properties1 Mark
MCQ
The noble gases are nonreactive because :
  • A
    They react with sodium.
  • ✓
    They have a full outer shell of electrons.
  • C
    They have a half outer shell of neutrons.
  • D
    They are too thin.
✓

Answer

Correct option: B.
They have a full outer shell of electrons.
They have $8$ electrons in their outermost shell $($except He which has $2$ electrons$)$. Therefore, their valency is zero and they are nonreactive as they can neither add nor donate electrons to react.

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

Explore more

More "M.C.Q (1 Marks)" from Classification of Elements and Periodicity in Properties→Classification of Elements and Periodicity in Properties — all question types→Chemistry STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

In the hydrocarbon,

$\mathop C\limits_6 {H_3} - \mathop C\limits_5 H = \mathop C\limits_4 H - \mathop C\limits_3 {H_2} - \mathop C\limits_2  \equiv \mathop C\limits_1 H$

The state of hybridization of carbons $1, 3$ and $5$ are in the following sequence

→
Which among the following electron transition $(n_2 → n_1)$ in $H-$ atom, minimum change in its orbit radius $(r_2 - r_1) $ is observed-
→
Which is not example of Bronsted Lowry theory
→
The entropy of a sample of a certain substance increases by $0.836\,J\,K^{-1}$ on adding reversibly $0.3344\,J$ of heat at constant temperature. The temperature of the sample is.....$K$
→
Which statement correctly completes the statement ?
Except for glycine, which is achiral, all the amino acids present in proteins ......
→
The bond enthalpies of $H_2,\, X_2$ and $HX$ are in the ratio of $2 : 1 : 2$ . If the enthalpy for formation of $HX$ is $-50\, kJ\, mol^{-1}$ , the bond enthalpy of $H_2$ is .....$kJ\,mol^{-1}$
→
At $3000\, K$ the equilibrium pressures of $CO_2$, $CO$ and $O_2$  are $0.6$,$0.4 $ and $0.2$ atmospheres respectively. ${K_p}$ for the reaction, $2C{O_2}$ $\rightleftharpoons$ $2CO + {O_2}$ is
→
Among the following the dissociation constant is highest for
→
The crystal lattice of ice is mostly formed by
→
The correct order for the decrease in atomic radii is
→