Electronic Configuration and Atomic Radii

Q.

Why are $\mathrm{Zn},\mathrm{Cd}\&\mathrm{Hg}$ not transition elements?

Q.

What is meant by covalent radius?

Q. The correct statement(s) about $C{r}^{2+}\text{and}M{n}^{3+}$ is/are:

1. $C{r}^{2+}$ is a reducing agent
2. $M{n}^{3+}$ is an oxidising agent
3. Both $C{r}^{2+}\text{and}M{n}^{3+}$ exhibit $d^4$ electronic configuration
4. When $C{r}^{2+}$ is used as a reducing agent the chromium ion attains a $d^5$ electronic configuration

Q. The atom that has the largest atomic radius among the following:

1. Cu
2. Ni
3. Zn
4. Co

Q. What is inner pair effect and lanthanide contraction ? Explain briefly about their cause including giving a idea of shielding and penetrating effect ?

Q.

Which of the following is the correct order of size of the given species
(a) $I>I^{-}>I^{+}$ (b) $I^{+}>I^{-}I$ (c) $I>I^{+}>I^{-}$ (d) $I^{-}>I>I^{+}$

Q.

Justify the placement of O, S, Se, Te and Po in the same group of the Periodic Table in terms of electronic configuration, oxidation state and hydride formation.

Q. Which of the following element has the highest density among transition metals?

1. Iridium
2. Tungsten
3. Scandium
4. Iron

Q. Which of the following is the correct order of ionic radii?

1. 
   $T{i}^{4+}<M{n}^{7+}$
2. $C{l}^{-}<K^{+}$
3. $C{a}^{2+}<K^{+}$
4. $O^{2-}<F^{-}$

Q. In which of the following arrangements, the order is according to the property indicated against it.
$\left(I\right)I<Br<F<Cl\text{increasing electron gain enthalpy}$
$\left(II\right)Li<Na<K<Rb\text{increasing metallic radius}$
$\left(III\right)B<C<N<O\text{increasing first ionization energy}$
$\left(IV\right)A{l}^{3+}<M{g}^{2+}<N{a}^{+}<F^{-}\text{increasing ionic size}$

1. $I,II\text{and}III$
2. $I\text{and}III\text{only}$
3. $I,II\text{and}IV$
4. $I\text{and}II\text{only}$

Q. Is lanthanide contraction applicable while moving down in all the groups of d-block or only application while moving down in groups 3rd and 4th ?

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

Q.

What are the factors responsible for the inaccuracy in atomic radius?

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. In which of the following arrangements, the order is according to the property indicated against it.
$\left(I\right)I<Br<F<Cl\text{increasing electron gain enthalpy}$
$\left(II\right)Li<Na<K<Rb\text{increasing metallic radius}$
$\left(III\right)B<C<N<O\text{increasing first ionization energy}$
$\left(IV\right)A{l}^{3+}<M{g}^{2+}<N{a}^{+}<F^{-}\text{increasing ionic size}$

1. $I,II\text{and}III$
2. $I\text{and}III\text{only}$
3. $I,II\text{and}IV$
4. $I\text{and}II\text{only}$

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 decreasing ionic radii among the following isoelectronic species is:

1. $C{l}^{-}>S^{2-}>C{a}^{2+}>K^{+}$
2. $C{l}^{-}>C{a}^{2+}>S^{2-}>K^{+}$
3. $K^{+}>S^{2-}>C{a}^{2+}>C{l}^{-}$
4. $S^{2-}>C{l}^{-}>K^{+}>C{a}^{2+}$

Q. Chemical name of Epsom salt is ____

Q. Statement 1: Transition elements in a particular period may have the same oxidation number.
Statement 2: They have a complete outer energy level.

1. Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.

2. Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.

3. Statement 1 is correct but Statement 2 is not correct.

4. Both the Statement 1 and Statement 2 are not correct.

5. Statement 1 is not correct but Statement 2 is correct.

Q. For isoelectronic species, ionic radii decrease with an increase in nuclear charge.

1. True
2. False

Q.

Which of the following is true regarding the trend in atomic size?

1. For d block elements, there is a regular increase in atomic radius as we move from left to right across the periodic table for the first transition series
2. As we move down the group 13, there is a regular increase in atomic radius
3. Atomic radius of Ne is greater than that of F
4. All of the above

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 $Ga$

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. Among the hydrides of group $16$ elements, which has the highest bond angle?

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

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

Q. The atom that has the largest atomic radius among the following:

1. Zn
2. Cu
3. Ni
4. Co

Q. The correct order of atomic size of C, N, P, S follows the order :

1. $N<C<S<P$
2. $N<C<P<S$
3. $C<N<S<P$
4. $C<N<P<S$

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

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

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