Download App

STD 11 - 3. Classification of elements and periodicity in properties — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 3. Classification of elements and periodicity in properties4 Marks
MCQ
Radius of the isoelectronic species
  • A
    Increases with the increase of nuclear charge
  • ✓
    Decreases with the increase of nuclear charge
  • C
    Is the same for all
  • D
    First increases and then decreases
✓

Answer

Correct option: B.
Decreases with the increase of nuclear charge
b
An isoelectronic series is a group of ions that all have the same number of electrons. For example, one isoelectronic series could include $O ^{2-}, F ^{-}, Na ^{+}, Mg ^{2+}$. These all have ten electrons.The number of protons, though, increases as atomic number increases, so nuclear charge increases. When we consider effective nuclear charge then, the ions of greater nuclear charge attract those ten electrons more strongly and pull them in more tightly. Therefore, the radii of the ions in an isoelectronic series decrease as nuclear charge (or atomic number) increases.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

NEET STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

Ionic radii of
→
Which of the following reactions occurs at the cathode of a common dry cell
→
The amino acid which is not optically active is
→
Which of the following elements are analogous to the lanthanides
→
For the equilibrium

$2{H_2}O \rightleftharpoons {H_3}{O^ + } + O{H^ - }$ , 

the value of $\Delta {G^o}$ at $298\,K$ is approximately .......$kJ\,mol^{-1}$

→
After a chemical reaction, the total mass of reactants and products
→
$IUPAC$ name of the compound is $C{H_3} - \mathop {\mathop {\mathop {\mathop {CH}\limits_{|\,\,\,\,\,} }\limits_{C{H_2}} }\limits_{|\,\,\,\,\,\,} }\limits_{C{H_3}} - C{H_2} - CH(OH) - C{H_3}$ is
→
To prevent corrosion, iron pipes carrying drinking water are covered with zinc. The process involved is
→
$1, 2, 3$ -trihydroxybenzene is also known as
→
The order of basicity of amines in gaseous state is
→