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Classification of Elements and Periodicity in Properties

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Chemistry Part I

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Chemistry

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Class 10 Class 12

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+

2186 Views

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

  • CO subscript 3 superscript 2 minus end superscript comma space SO subscript 3 superscript 2 minus end superscript
  • ClO subscript 3 superscript minus comma space CO subscript 3 superscript 2 minus end superscript
  • SO subscript 3 superscript 2 minus end superscript comma NO subscript 3 superscript minus
  • ClO subscript 3 superscript minus comma space SO subscript 3 superscript 2 minus end superscript

D.

ClO subscript 3 superscript minus comma space SO subscript 3 superscript 2 minus end superscript

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

2058 Views

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 is 

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 is 

H- > H >H+

1051 Views