Question

When silicon combines with hydrogen it is very reactive why

Answer 1

Answer:

So it is more reactive than Si even though they both are tetravalent. The catenation bonds of silicon are very weak. C-C bond is much stronger than Si-Si bond ; thus silicon bonds break easily. Hence compounds of Carbon are much more stable than Silicon.

Answer 2

Answer:

Explaination:

The name silicon derives from the Latin silex or silicis, meaning “flint” or “hard stone.” Amorphous elemental silicon was first isolated and described as an element in 1824 by Jöns Jacob Berzelius, a Swedish chemist. Impure silicon had already been obtained in 1811. Crystalline elemental silicon was not prepared until 1854, when it was obtained as a product of electrolysis. In the form of rock crystal, however, silicon was familiar to the predynastic Egyptians, who used it for beads and small vases; to the early Chinese; and probably to many others of the ancients. The manufacture of glass containing silica was carried out both by the Egyptians—at least as early as 1500 BCE—and by the Phoenicians. Certainly, many of the naturally occurring compounds called silicates were used in various kinds of mortar for construction of dwellings by the earliest people.

Element Properties

atomic number 14

atomic weight 28.086

melting point 1,410 °C (2,570 °F)

boiling point 2,355 °C (4,270 °F)

density 2.33 grams/cm3

oxidation state −4, (+2), +4

electron configuration 1s22s22p63s23p2

Occurrence And Distribution

On a weight basis, the abundance of silicon in the crust of Earth is exceeded only by oxygen. Estimates of the cosmic abundance of other elements often are cited in terms of the number of their atoms per 106 atoms of silicon. Only hydrogen, helium, oxygen, neon, nitrogen, and carbon exceed silicon in cosmic abundance. Silicon is believed to be a cosmic product of alpha-particle absorption, at a temperature of about 109 K, by the nuclei of carbon-12, oxygen-16, and neon-20. The energy binding the particles that form the nucleus of silicon is about 8.4 million electron volts (MeV) per nucleon (proton or neutron). Compared with the maximum of about 8.7 million electron volts for the nucleus of iron, almost twice as massive as that of silicon, this figure indicates the relative stability of the silicon nucleus.

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