Similarity between boron and silicon

1.
Slash rule

In the elements of the second and third periods of the periodic table, the elements and compounds of several pairs of elements at the upper left and lower right diagonal positions have similar properties.
People call this phenomenon the diagonal rule or diagonal rule, such as Li With Mg, Be and Al, B and Si
.

The oblique line rule is established because the ion potentials (that is, the charge radius ratio) of the pairs of elements at the oblique line position are similar
.

2.
Really similar to silicon

(1) Boron chloride and silicon chloride hydrolyzate are similar, both generate oxyacid and hydrogen chloride
.

(2) The fluoride of boron is similar to the hydrolyzate of fluoride of silicon, and the HF produced by the hydrolysis further reacts with the fluoride
.

(3) Both boron and silicon hydrides have poor thermal stability and are easy to decompose
.

However, the decomposition products of the two are different.

(4) Boron and silicon have strong hydride reduction ability and spontaneous combustion in the air
.

(5) Both boron and silicon hydrides are easily hydrolyzed
.

What actually takes place is an oxidation-reduction reaction.

(6) Boric acid and silicic acid are both extremely weak acids