Electronic Configuration and Atomic Radii

Q. van der waals radius is:

1. Twice the bond length
2. Half the bond length
3. Half the distance between centres of nuclei of two non bonded atoms of adjacent molecules in solid state
4. Equal to covalent radius

Q. In comparison to the parent atom, the size of the positive ion is:

1. 
   Smaller
2. 
   Normal
3. 
   Equal
4. 
   Greater

Q. The correct order of atomic radii for the following species is $Na,Li,Rb,$ and $K$ is:

1. 
   $Li>Na>K>Rb$
   
2. 
   $Rb>K>Na>Li$
3. 
   $Na>Li>K>Rb$
4. 
   $Rb>K>Li>Na$

Q. The correct order of atomic radii for the following isoelectronic species $F^{-},O^{2-},N{a}^{+},M{g}^{2+}$ is:

1. $M{g}^{2+}>N{a}^{+}>O^{2-}>F^{-}$
2. $O^{2-}>F^{-}>M{g}^{2+}>N{a}^{+}$
3. $M{g}^{2+}>F^{-}>O^{2-}>N{a}^{+}$
4. $M{g}^{2+}>O^{2-}>N{a}^{+}>F^{-}$

Q. The correct order of atomic radii for the following species $S,P,Se$ and $Cl$ is:

1. 
   $Cl>S>Se>P$
2. 
   $Se>P>S>Cl$
3. 
   $S>Cl>Se>P$
4. 
   $Cl>S>P>Se$

Q. van der waals radius is:

1. Twice the bond length
2. Half the bond length
3. Half the distance between centres of nuclei of two non bonded atoms of adjacent molecules in solid state
4. Equal to covalent radius

Q. In comparison to the parent atom, the size of the positive ion is:

1. 
   Equal
2. 
   Normal
3. 
   Smaller
4. 
   Greater

Q. The elements of group 1 describe, more clearly than any other group of elements, the effects of increasing the size of atoms or ions on the physical and chemical properties. The chemical and physical properties of the elements are closely related to their electronic structures and sizes. These metals are highly electropositive and thus from very strong bases, and have quite stable oxo-salts. In the manufacturing of sodium hydroxide, chlorine and sodium carbonate, the sodium chloride is used as starting material

Which of the following acts as an oxidising as well as reducing agent?

1. $N{a}_{2}O$
2. $HN{O}_3$
3. $NaN{O}_3$
4. $NaN{O}_2$

Q. Which of the following statement is correct:

1. $H^{+}$ is the smallest size cation in the periodic table
2. van der Waals radius of chlorine is more than covalent radius
3. Ionic mobility of hydrated $L{i}^{+}$ is greater than that of hydrated $N{a}^{+}$
4. $He$ atom has the highest ionisation enthalpy in the periodic table

Q. The atomic size of $Ga$ and $Al$ are almost same because of:

1. Poor shielding effect of $d-$orbitals electrons in $Ga$
2. More shielding effect of $d-$electrons in $Ga$
3. Poor shielding effect of $f-$orbital in $Ga$
4. High shielding effect of $3s,3p$ and $3d$ electrons in $Ga$