Which of the following types of molecules always has a dipole moment? Linear molecules with two identical bonds. Trigonal pyramid molecules (three identical bonds). Trigonal planar molecules (three identical bonds equally spaced). Tetrahedral molecules (four identical bonds equally spaced). None has a dipole moment.

In trigonal pyramidal molecule like molecule of ammonia , the vector some of intra- molecular dipole moment is not zero because the bonds are not symmetrically oriented . In other molecules , bonds are symmetrically oriented in space so the vector sum of all the internal dipole moment vectors cancel each other to make total dipole moment zero.

Lanuel Lanuel · Answer 2 · 2021-11-23T17:44:48+01:00

The type of molecules that always have a dipole moment is: B. Trigonal pyramid molecules (three identical bonds).

A molecule can be defined as a group of two (2) or more atoms that are chemically bonded together by means of shared electrons.

Also, a molecule form the smallest, fundamental ((basic) unit of a chemical compound or substance and they are capable of taking part in a chemical reaction.

In Chemistry, a dipole moment occurs whenever there is a separation of charge between molecules.

Trigonal pyramidal molecules have three (3) atoms at their trigonal base corners and one (1) atom at the top.

Additionally, a trigonal pyramidal molecule with three (3) identical bonds always have a dipole moment because bond the can't cancel one another.

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