Answer
Verified
388.2k+ views
Hint: Isoelectronic species have the same number of electrons. : In isoelectronic species, as the nuclear charge increases, the force of attraction by the nucleus on the electrons also increases.
Complete answer:
Isoelectronic species or ions are the ions of different elements that have the same number of electrons but differ in the magnitude of the nuclear charge.
Besides ions, a neutral atom may also the same number of electrons hence it is also isoelectronic species.
Example, sulphide ion (${{S}^{2-}}$ ), chloride ion ($C{{l}^{-}}$), argon (Ar), and potassium ion (${{K}^{+}}$ ) are isoelectronic species.
Variation of size among isoelectronic species: As the nuclear charge increases, the force of attraction by the nucleus on the electrons also increases. As a result, the ionic radius decreases.
Let us observe all the options one by one:
(a)- $N{{a}^{+}},M{{g}^{2+}}A{{l}^{3+}},C{{l}^{-}}$
Sodium ion has 10 electrons
Magnesium ion has 10 electrons
Aluminum ion has 10 electrons
Chlorine ion has 18 electrons
(b)- $N{{a}^{+}},C{{a}^{2+}}S{{c}^{3+}},{{F}^{-}}$
Sodium ion has 10 electrons
Calcium has 18 electrons
Scandium ion has 18 electrons
Fluorine ion has 10 electrons
(c)- ${{K}^{+}},C{{l}^{-}},C{{a}^{2+}}S{{c}^{3+}}$
Potassium ion has 18 electrons
Chlorine ion has 18 electrons
Calcium ion has 18 electrons
Scandium ion has 18 electrons
(d)- ${{K}^{+}},C{{a}^{2+}},S{{c}^{3+}},{{F}^{-}}$
Potassium ion has 18 electrons
Calcium ion has 18 electrons
Scandium ion has 18 electrons
Fluorine ions have 10 electrons.
Hence, only option (c) has all the ions containing 18 electrons, therefore, ${{K}^{+}},C{{l}^{-}},C{{a}^{2+}}S{{c}^{3+}}$ are isoelectronic species.
So, the correct answer is “Option C”.
Note: The nuclear charge is calculated by the number of electrons + charge on the ion.
For example, In Ar,${{K}^{+}}$ and$C{{a}^{2+}}$ the number of electrons is 18.
The nuclear charge of Ar is 18 because there is no charge on the ion.
The nuclear charge of the ${{K}^{+}}$ ion is 19 because potassium ion has a +1 charge.
The nuclear charge of the $C{{a}^{2+}}$ ion is 20 because calcium ion has a +2 charge.
Complete answer:
Isoelectronic species or ions are the ions of different elements that have the same number of electrons but differ in the magnitude of the nuclear charge.
Besides ions, a neutral atom may also the same number of electrons hence it is also isoelectronic species.
Example, sulphide ion (${{S}^{2-}}$ ), chloride ion ($C{{l}^{-}}$), argon (Ar), and potassium ion (${{K}^{+}}$ ) are isoelectronic species.
Variation of size among isoelectronic species: As the nuclear charge increases, the force of attraction by the nucleus on the electrons also increases. As a result, the ionic radius decreases.
Let us observe all the options one by one:
(a)- $N{{a}^{+}},M{{g}^{2+}}A{{l}^{3+}},C{{l}^{-}}$
Sodium ion has 10 electrons
Magnesium ion has 10 electrons
Aluminum ion has 10 electrons
Chlorine ion has 18 electrons
(b)- $N{{a}^{+}},C{{a}^{2+}}S{{c}^{3+}},{{F}^{-}}$
Sodium ion has 10 electrons
Calcium has 18 electrons
Scandium ion has 18 electrons
Fluorine ion has 10 electrons
(c)- ${{K}^{+}},C{{l}^{-}},C{{a}^{2+}}S{{c}^{3+}}$
Potassium ion has 18 electrons
Chlorine ion has 18 electrons
Calcium ion has 18 electrons
Scandium ion has 18 electrons
(d)- ${{K}^{+}},C{{a}^{2+}},S{{c}^{3+}},{{F}^{-}}$
Potassium ion has 18 electrons
Calcium ion has 18 electrons
Scandium ion has 18 electrons
Fluorine ions have 10 electrons.
Hence, only option (c) has all the ions containing 18 electrons, therefore, ${{K}^{+}},C{{l}^{-}},C{{a}^{2+}}S{{c}^{3+}}$ are isoelectronic species.
So, the correct answer is “Option C”.
Note: The nuclear charge is calculated by the number of electrons + charge on the ion.
For example, In Ar,${{K}^{+}}$ and$C{{a}^{2+}}$ the number of electrons is 18.
The nuclear charge of Ar is 18 because there is no charge on the ion.
The nuclear charge of the ${{K}^{+}}$ ion is 19 because potassium ion has a +1 charge.
The nuclear charge of the $C{{a}^{2+}}$ ion is 20 because calcium ion has a +2 charge.
Recently Updated Pages
Basicity of sulphurous acid and sulphuric acid are
Three beakers labelled as A B and C each containing 25 mL of water were taken A small amount of NaOH anhydrous CuSO4 and NaCl were added to the beakers A B and C respectively It was observed that there was an increase in the temperature of the solutions contained in beakers A and B whereas in case of beaker C the temperature of the solution falls Which one of the following statements isarecorrect i In beakers A and B exothermic process has occurred ii In beakers A and B endothermic process has occurred iii In beaker C exothermic process has occurred iv In beaker C endothermic process has occurred
What is the stopping potential when the metal with class 12 physics JEE_Main
The momentum of a photon is 2 times 10 16gm cmsec Its class 12 physics JEE_Main
How do you arrange NH4 + BF3 H2O C2H2 in increasing class 11 chemistry CBSE
Is H mCT and q mCT the same thing If so which is more class 11 chemistry CBSE
Trending doubts
How do you solve x2 11x + 28 0 using the quadratic class 10 maths CBSE
Which type of bond is stronger ionic or covalent class 12 chemistry CBSE
What organs are located on the left side of your body class 11 biology CBSE
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
Difference Between Plant Cell and Animal Cell
How fast is 60 miles per hour in kilometres per ho class 10 maths CBSE
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
The Equation xxx + 2 is Satisfied when x is Equal to Class 10 Maths
When people say No pun intended what does that mea class 8 english CBSE