Question 1 :
<div>Arrange the following elements in increasing order of their atomic radii.<br/></div>$Li,\ Be,\ F,\ N$<br/>

Question 2 :
The maximum number of valence electrons possible for atoms in the second period of the periodic table is :

Question 5 :
In which group all the elements do not have same number of valence electrons?<br>

Question 9 :
Among the elements $Ca, Mg, P$ and $Cl$, the order of increasing atomic radii is:

Question 10 :
In modern periodic table, arrange the third row elements Na, Mg, AI and Si in the increasing order of their atomic size.

Question 11 :
<div>Arrange the following elements in increasing order of their atomic radii.<br/></div>$Li,\ Be,\ F,\ N$<br/>

Question 13 :
Why does the size of atom increases as we go down the group?

Question 14 :
Statement I: Atomic radii decrease down a group.<br/>Statement II: The higher the atomic number within a group, the smaller the atom.<br/>

Question 16 :
The element with the smallest size in the group 13 is :<br/>

Question 20 :
The tendency of atom to attract shared pair of electrons is known as electron affinity.

Question 22 :
The Periodic Table lists all the known elements.<br>Elements are arranged in order of .......$1$....... number.<br>The melting points of Group I elements .......$2$....... down the group.<br>The melting points of Group VII elements .......$3$....... down the group.<br>Which words correctly complete gaps $1, 2$ and $3$?

Question 24 :
From the elements of the following atomic numbers $9, 12, 16, 20, 38, 47$ and $56$, identify the elements that belong to same group in periodic table:

Question 26 :
Which of the following elements would have the largest atomic radius?

Question 29 :
The element having the least number of electron shells is :

Question 30 :
The high ionistion potential of magnesium compared with aluminium is due to :<br/>

Question 31 :
Which metals upon heating in presence of air followed by hydrolysis gives Ammonia?

Question 32 :
Consider the $M(OH)_3$ formed by all the group 13 elements. The correct sequence of acidic strength of hydroxides $[M(OH)_3]$ is:-<br/>

Question 33 :
Which one of the following arrangement represents the correct order of electron gain enthalpy (with negative sign) of given atomic species?

Question 34 :
Which group of atoms have nearly the same atomic radius ?

Question 35 :
Pentavalence in phosphorus is more stable when compared to that of nitrogen even though they belong to same group is due to :

Question 36 :
Which of the following element is expected to have highest electron gain enthalpy :<br/>

Question 39 :
The period of element having three shells with three electrons in valence shell is:

Question 40 :
Assertion: Atomic size decreases as we move from left to right in a period. Reason: In a period from left to right the number of valence electrons in the same shell increases.

Question 41 :
Which is the correct order of increasing energy of the listed orbitals in the atom of titanium?<br>(At. no. $Z=22$)

Question 43 :
Assertion: $PbI_{4}$ doesn't exist and converts into $PbI_{2}$ and $I_{2}$ spontaneously at room temperature but $PbCl_{4}$ needs heating to convert into $PbCl_{2}$ and $Cl_{2}$. Reason: $Pb^{2+}$ is more stable than $Pb^{4+}$ due to inert pair effect.

Question 44 :
Which of the following statements is/are true for the long form of the periodic table?

Question 45 :
The first ($\Delta H_{1}$) and second ($\Delta H_{2}$) ionisation enthalpies (in $kJ mol^{-1}$) and the electron gain enthalpy ($\Delta_{eg}H$) (in $kJ mol^{-1}$) of the elements I, II, III, IV and V are given below:<br><br><table class="wysiwyg-table"><tbody><tr><td>Element</td><td>$\Delta_{1}H_{1}$</td><td>$\Delta_{1}H_{2}$</td><td>$\Delta_{eg}H$</td></tr><tr><td>I</td><td>520</td><td>7300</td><td>-60</td></tr><tr><td>II</td><td>419</td><td>3051</td><td>-48</td></tr><tr><td>II</td><td>1681</td><td>3374</td><td>-328</td></tr><tr><td>IV</td><td>1008</td><td>1846</td><td>-295</td></tr><tr><td>V</td><td>2372</td><td>5251</td><td>+48</td></tr></tbody></table>The most reactive metal and the least reactive non-metal of these are respectively.<br>

Question 46 :
Assertion: Atomic number of the element ununtrium is 113. Reason: According to IUPAC systematic nomenclature, the numerical roots for 1,1 and 3 are un, un and tri respectively.

Question 47 :
The charge/size ratio of a cation determines its polarizing power. Which one of the following sequences represents the increasing order of the polarizing power of the cationic species, K$^{+}$, Ca$^{2+}$, Mg$^{2+}$, Be$^{2+}$?

Question 48 :
The species among the following having the highest electron affinity is :

Question 49 :
Assign the position of the element having outer electronic configuration,<br/>(A) $ns^2np^2\,(n =6)$<br/>(B) $(n - 1)d^2ns^2\,(n=4)$<br/>(C) $(n-2)f^7(n-1)d^{1}ns^2\,(n=6)$<br/>Which of the following statement(s) is/are correct?

Question 50 :
Within each pair of elements F &amp; Cl, S &amp; Se, and Li &amp; Na respectively, the elements that release more energy upon an electron gain are:

Question 51 :
Which of the following represent(s) the correct order of electron affinities ?<br/>

Question 52 :
Most transition metals from multiple cations, that is, they have more than one possible amount of positive charge. Virtually all of the transition metals form dipositive $(2+)$ cations, along with one or more other forms. For example, titanium forms $Ti^{2+}$ ad $Ti^{4+}$, and cobalt forms $Co^{2+}$ and $Co^{3+}$.<br>The principal exceptions to this predominance of cations with a $2^{+}$ charge are scandium and yttrium, which form only tripositive cations. $Sc^{3+}$ and $Y^{3+}$, and copper and silver, which form cations with a single positive charge. $Cu^{+}$ and $Ag^{+}$.<br>[While copper also forms dipositive $Cu^{2+}$, silver exhibits the single positive state essentially exclusively.]<br>Which of the following offers a POSSIBLE explanation for the existence of $Cu^{+}$ and $Ag^{+}$?

Question 53 :
Ionisation energy in group $1A$ varies in the decreasing order as:

Question 54 :
Among the elements Ca, Mg, P, Cl, the order of increasing atomic radii is :

Question 56 :
Given $\Delta $ H (Ionization enthalpy) for the process is 19800 kJ/mole &amp; $IE_{1}$ for Li is 520, then $IE_{2}$ &amp; $IE_{3}$ of $Li^{+}$ are _______ respectively. <div>[Note : approx. value]<br/></div>