Answer
Verified
40.2k+ views
Hint: (1) An anion is attracted towards the anode in electrolysis and hence the name anion.
(2) Increase in the number of electrons leads to increase in the atomic size.
(3) Increase in the number of electrons in an atom leads to decrease in the effective nuclear charge experienced by the outermost electron.
(4) An electron cloud defines the region which has a high probability of containing electrons.
Complete step by step answer: An ion which results from an atom or molecule when it gains one or more valence electrons thereby giving a negative charge is called an anion. Thus, anions have more electrons than protons. Therefore, the statement A is true.
The ionic radius of an ion is equal to the distance between the centre of the nucleus of the ion and its outermost shell containing electrons. When extra electrons are added, this distance will increase and hence the ionic radius of an anion will increase and will be larger than the parent atom. So, statement B is true.
Effective nuclear charge is the attractive force faced by the electron when it is shielded by the core electrons. When the number of electrons increases, the shielding of the outermost electron by the core electrons will increase and hence the nuclear charge experienced by it will be reduced. This happens in the case of an anion. So, statement C is not true.
Due to increase in electrons in an anion, the repulsion among the electrons increases leading to the increase in the size of the electron cloud and thus the electron cloud expands. So, the statement D is true.
So, thus option C is not true.
Note: The ion which is formed by the loss of electrons is known as cation. It has more protons and electrons and hence, it has positive charge. The ionic radius of the cation is smaller than the radius of the parent atom which also means that the radius of the cation is smaller than the radius of the corresponding anion. Moreover, the effective nuclear charge will increase when a cation is formed.
(2) Increase in the number of electrons leads to increase in the atomic size.
(3) Increase in the number of electrons in an atom leads to decrease in the effective nuclear charge experienced by the outermost electron.
(4) An electron cloud defines the region which has a high probability of containing electrons.
Complete step by step answer: An ion which results from an atom or molecule when it gains one or more valence electrons thereby giving a negative charge is called an anion. Thus, anions have more electrons than protons. Therefore, the statement A is true.
The ionic radius of an ion is equal to the distance between the centre of the nucleus of the ion and its outermost shell containing electrons. When extra electrons are added, this distance will increase and hence the ionic radius of an anion will increase and will be larger than the parent atom. So, statement B is true.
Effective nuclear charge is the attractive force faced by the electron when it is shielded by the core electrons. When the number of electrons increases, the shielding of the outermost electron by the core electrons will increase and hence the nuclear charge experienced by it will be reduced. This happens in the case of an anion. So, statement C is not true.
Due to increase in electrons in an anion, the repulsion among the electrons increases leading to the increase in the size of the electron cloud and thus the electron cloud expands. So, the statement D is true.
So, thus option C is not true.
Note: The ion which is formed by the loss of electrons is known as cation. It has more protons and electrons and hence, it has positive charge. The ionic radius of the cation is smaller than the radius of the parent atom which also means that the radius of the cation is smaller than the radius of the corresponding anion. Moreover, the effective nuclear charge will increase when a cation is formed.
Recently Updated Pages
silver wire has diameter 04mm and resistivity 16 times class 12 physics JEE_Main
A parallel plate capacitor has a capacitance C When class 12 physics JEE_Main
A series combination of n1 capacitors each of value class 12 physics JEE_Main
When propyne is treated with aqueous H2SO4 in presence class 12 chemistry JEE_Main
Which of the following is not true in the case of motion class 12 physics JEE_Main
The length of a potentiometer wire is 10m The distance class 12 physics JEE_MAIN
Other Pages
The mole fraction of the solute in a 1 molal aqueous class 11 chemistry JEE_Main
Formula for number of images formed by two plane mirrors class 12 physics JEE_Main
In order to convert Aniline into chlorobenzene the class 12 chemistry JEE_Main
Explain the construction and working of a GeigerMuller class 12 physics JEE_Main
Which of the following is not a redox reaction A CaCO3 class 11 chemistry JEE_Main
If a wire of resistance R is stretched to double of class 12 physics JEE_Main