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Chapter 14: Q14.90P (page 623)

Which Group 5A (15) elements form trihalides? Pentahalides? Explain.

Short Answer

Expert verified

Except for nitrogen all the other elements of group 15 form pentahalides, while trihalides are formed by all the elements of the group.

Step by step solution

01

Group 15 elements

Group 15 elements belonging to the nitrogen family. They include nitrogen, phosphorus, arsenic, antimony, bismuth, and moscovium.

The atomic numbers of the group 15 elements are as follows;

Nitrogen (N) = 7

Phosphorus (P) = 15

Arsenic (As) = 33

Antimony (Sb) = 51

Moscovium (Mc) = 83

02

Trihalides and Pentahalides of group 15

P, Sb, As, and Bi react directly with halogens. Generally,Sb, As, and Bi forms trihalides and pentahalides. We know the pentahalides of Sb, As, and Bi are well known. Among the group 15 phosphorus form all trihalides but not all pentahalides since is not known.

So overall we can conclude all the elements of group 15 except nitrogen from pentahalides. As nitrogen does not have a d-orbital so it cannot form pentahalides.

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