Atomic and Ionic Sizes of Lanthanides

Q. The correct order of size is

1. $P{r}^{3+}>D{y}^{3+}>E{u}^{3+}>T{m}^{3+}$
2. $E{u}^{3+}>P{r}^{3+}>D{y}^{3+}>T{m}^{3+}$
3. $P{r}^{3+}>T{m}^{3+}>E{u}^{3+}>D{y}^{3+}$
4. $P{r}^{3+}>E{u}^{3+}>D{y}^{3+}>T{m}^{3+}$

Q.

Choose incorrect option:-
1. Transition elements exhibit higher enthalpies of atomization.
2. Zinc is a transition element
3. Melting and boiling points increases steadily from Sc to Cu.

1. 1 & 2
2. 2&3
3. 1, 2 & 3
4. 3 only.

Q. Ionic radii gradually increases from $S{c}^{+2}toC{u}^{+2}$ in 3d series – True or False?

1. False
2. True

Q. Which of the following statement is true with respect to 3d series?

1. Atomic radii gradually decreases from Sc to Zn.
2. Most of these elements have very similar atomic radii. There is hardly any appreciable variation.
3. Atomic radii gradually decreases from Sc to Cr.
4. Atomic radii gradually increases from Sc to Cr.

Q. Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii? (Numbers in the parenthesis are atomic numbers)

1. Zr(40) and Ta(73)
2. Ti(22) and Zr(40)
3. Zr(40) and Nb (41)
4. Zr(40) and Hf(72)

Q. Arrange $C{e}^{+3},L{a}^{+3},P{m}^{+3}$ and $Y{b}^{+3}$ in increasing order of their ionic radii

1. 
2. 
3. 
4. 

Q. Reason of lanthanoid contraction is

1. Increasing nuclear charge
2. Neglibible screening effect of ‘f’ - orbitals
3. Decreasing nuclear charge
4. Decreasing screening effect

Q. Identify the incorrect statement among the following:

1. d-block elements show irregular and erratic chemical properties among themselves
2. The chemistry of various lanthanoids are very similar
3. La and Lu have partially filled d orbitals only
4. 4f and 5f orbitals are equally shielded

Q. Lanthanide contraction is due to an increase in:

1. Shielding by 4f electrons
2. Atomic number
3. Effective nuclear charge
4. Size of 4f orbitals

Q. Which graph shows the correct trends for the size of $L{n}^{3+}$ ions?

1. 
2. 
3. 
4.