ï»¿ which of the following orders of ionic radii is correctly represented? from Chemistry Classification of Elements and Periodicity in Properties Class 12 Nagaland Board

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Class 10 Class 12

Which of the following pairs of ions are isoelectronic and isostructural?Â

D.

Isostructural chemical compounds have similar chemical structures.
Isoelectronic terms refer to two atom, ions or molecules that have the same number of valence electrons.

ClO3- = SO32-
Â Number of electrons
CO32- = 6+2+24 =32
SO32- = 16+2+24 = 32
ClO32- = 17+24+1 = 42
NO32- = 7+2+24 = 33
HenceÂ ClO32- andÂ SO32-Â  are isoelectronic and are pyramidal in shape.

Isostructural chemical compounds have similar chemical structures.
Isoelectronic terms refer to two atom, ions or molecules that have the same number of valence electrons.

ClO3- = SO32-
Â Number of electrons
CO32- = 6+2+24 =32
SO32- = 16+2+24 = 32
ClO32- = 17+24+1 = 42
NO32- = 7+2+24 = 33
HenceÂ ClO32- andÂ SO32-Â  are isoelectronic and are pyramidal in shape.

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Be2+ is isoelectronic with which of the following ions?

• H+

• Li+

• Na+

• Mg+

B.

Li+

Isoelectronic species contain the same number of electrons Be2+ contains 2 electrons. Among the given options, only Li+ contains 2 electrons and therefore, it is isoelectronic with Be2+.
H+ --> no electron; Na+ --> 10e-
Li+ --> 2e-;
Mg2+ --> 10 e-
Hence, Be2+ is isoelectronic with Li+

Isoelectronic species contain the same number of electrons Be2+ contains 2 electrons. Among the given options, only Li+ contains 2 electrons and therefore, it is isoelectronic with Be2+.
H+ --> no electron; Na+ --> 10e-
Li+ --> 2e-;
Mg2+ --> 10 e-
Hence, Be2+ is isoelectronic with Li+

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which of the following orders of ionic radii is correctly represented?

• H- > H >H+

• Na+ >F- >O2-

• F- > O2->Na+

• Al3+> Mg2+>N3-

A.

H- > H >H+

It is known that radius of the cation is always smaller than that of the neutral atom due to decrease in the number of orbits.Whereas, the radius of the anion is always greater than a cation due to a decrease in effective nuclear charge. Hence, the correct order isÂ

H- > H >H+

It is known that radius of the cation is always smaller than that of the neutral atom due to decrease in the number of orbits.Whereas, the radius of the anion is always greater than a cation due to a decrease in effective nuclear charge. Hence, the correct order isÂ

H- > H >H+

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