Question 1 :
Electrons can revolve round the nucleus at any radial distance from the nucleus.<br/><br/>

Question 3 :
Which element has twice as many electrons in its second shell as compared to its first shell?

Question 4 :
${ _{ 92 }^{ }{ X } }_{ }^{ 238 }\longrightarrow \quad A+{ _{ 2 }^{ }{ He } }_{ }^{ 4 }$<br>The number of neutrons in element '$A$' will be-

Question 6 :
Choose the correct option.<br/>In the outermost shell of any atom :

Question 8 :
The particles which cannot be deflected under the presence of electric field are:

Question 11 :
The distribution of electrons in various shells of an atom is given by _______.

Question 16 :
Maximum no. of electrons that can be present in M &amp; N shells respectively are ________.

Question 17 :
Neutrons has no charge but mass equal to that of ________.

Question 18 :
The experiment which led to the discovery of nucleus was performed by&#160;:

Question 19 :
The electron which is newly added to the atom in the outer most shell of an atom is called the valence electron.<br/>

Question 21 :
Assertion: Octet rule is based upon the chemical inertness of noble gases. Reason: Octet rule can explain the shape and relative stability of the molecule.

Question 22 :
Which of the following particle has mass closest to the mass of a proton?

Question 25 :
Maximum number of electrons that can be filled in the&#160;third orbit of an atom is :

Question 27 :
Which of the following pairs has elements with same number of neutrons?

Question 28 :
The formula of the compound is $A_2B_5$. The number of electrons in the outermost orbits of $A$ and $B$ respectively are:

Question 29 :
The atomic number of an element which shows a valency of $+3$ is :

Question 30 :
Match the column- I with Column - II and select the correct answer:<br/><table class="wysiwyg-table"><tbody><tr><td>Column - I</td><td>Column -II</td></tr><tr><td>(I) Curie</td><td>A. $10^6 \, dis \, sec^{-1}$</td></tr><tr><td>(II) Rutherford</td><td>B. $3.7 \times 10^{10} \, dis\, sec^{-1}$</td></tr><tr><td>(III) Becquerel</td><td>C. 1 dis $sec^{-1}$</td></tr></tbody></table>

Question 31 :
$\alpha-$ particles of 6 MeV energy is scattered back from a silver foil. Calculate the maximum volume where the entire charge of the atom is supposed to be accumulated.&#160;[$Z$ for silver $= 47$]

Question 32 :
The oxidation state of Barium in $Ba({ H }_{ 2 }{ PO }_{ 2 }{ ) }_{ 2 }$&#160; is: