What is the Lewis dot structure of #BH_3#? How many lone pair electrons are in this molecule? How many bonding pairs of electrons are in this molecule? How many lone pair electrons are at the central atom?

Answer 1

Well, there are 6 electrons to distribute in #BH_3#, however, #BH_3# does not follow the pattern of #"2-centre, 2 electron"# bonds.

Boron has 3 valence electrons, and hydrogen has the 1; thus there are 4 valence electrons. The actual structure of borane is as diborane #B_2H_6#, i.e. #{H_2B}_2(mu_2-H)_2#, in which there are #"3-centre, 2 electron"# bonds, bridging hydrogens which bind to 2 boron centres. I would suggest that you get your text, and read in detail how such a bonding scheme operates.
By contrast, in ethane, #C_2H_6#, there are enough electrons to form #7xx"2-centre, 2 electron"# bonds, i.e. the #C-C# linkage, and #6xx"C-H"# bonds.
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Answer 2

BH₃ has a trigonal planar molecular geometry. There are no lone pair electrons in this molecule. It has three bonding pairs of electrons. The central atom (Boron) has no lone pair electrons.

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Answer 3

The Lewis dot structure of BH3 is:

B: H : H : H

There are 0 lone pair electrons in this molecule. There are 3 bonding pairs of electrons in this molecule. There are 0 lone pair electrons at the central atom.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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