An atom of the element A has 3 electrons in its outermost shell while another atom X has 6 electrons in its outermost shell. The formula of the compou

Correct Answer - D Outermost electronic configuration of group 16 element is `ns^2` `np^4`.

Correct Answer - A Five vacant orbitals (3d-level) are present in Cl `(1s^2 2s^2 2p^6 3s^2 3p^5)` which belongs to 3rd period.

Correct Answer - C Since the common oxidation state of metal is -2. This indictaes it is 2 electrons short of noble gas configuration. Therefore, it has six electrons in valence...

Correct Answer - C Configuration of `Cl^-` ion is `1s^2 2s^2 2p^6 3s^2 3p`

It is given that, `E_(K)=35.2keV,E_(L)=5.25keV,E_(M)=0.55 keV` `rArr" " E_(K)-E_(L)=(hc)/(lambda_(K_(A_(alpha))))=hv_(K_(alpha))` `rArr(35.2-5.25)xx10^(3)xx1.6xx10^(-19)=6.6xx10^(-34)v_(K_(alpha))` `rArr" " v_(K_(alpha))=(29.95xx10^(3)xx1.6xx10^(-19))/(6.6xx10^(-34))=7.2xx10^(-34)Hz` Similarly, `E_(K)-E_(M)=hv_(K_(beta))` `rArr" " v_(K_(beta))=((35.2-0.55)xx10^(3)xx1.63xx10^(-19))/(6.6xx10^(-34))=8.4xx10^(18)Hz` Also, `E_(L)-E_(M)=hv_(k_(alpha))` `rArr" " ((5.25-0.55)xx10^(3)xx1.6xx10^(-19))/(6.6xx10^(-34))=1.1xx10^(18)Hz`

Correct Answer - A `L=(nh)/(2pi)` it does not denpend on Z

Correct Answer - D `a=omega^(2)r` As `" " omegaprop(1)/(n^(3))" " and " : r propn^(2)` `" "aprop(1)/(n^(4))` `rArr" " (a_(M))/(a_(L))=((2)/(3))^(4)=(16)/(81)`

Correct Answer - D `beta`-decay means emission of electron form radioactive nucleus.

Correct Answer - D Helium has only two electrons in its valence shell. On the other hand all other noble gases have 8 electrons in their valence shell.

Correct Answer - A (a) The electronic configuration of Cu, Th, Cs and K are Cu(29) = 2, 8,, 18, 1 `Cu^(+) = 2,8,18` Th(90)= 2, 8, 18, 32, 18, 10,...