Distribution of electrons by energy levels) 2) 8) 4. Define the element. Give the formulas of its higher oxide, hydroxide and hydrogen compound. Indicate the nature of the connections. Give the reaction equations to support your conclusions.
Si + 14
1s2 2s2 2p6 3s2 3p2 .
This element is silicon Si.
There are 4 electrons on the outer energy level. The highest valence is IV.
Core charge + 14.
Higher oxide – silicon oxide SiO2 – acidic oxide.
Si + O2 = SiO2.
Silicon hydride SiH4.
Si + 2H2 = SiH4.
The highest silicon hydroxide is silicic acid H2SiO3.
Silicon oxide is an oxide insoluble in water; therefore, silicic acid cannot be obtained by the reaction of the interaction of acid oxide with water. An acid is produced by the interaction of its salt and another acid.
For example, the interaction of sodium silicate and hydrochloric acid forms sodium chloride and silicic acid, which precipitates.
Na2SiO3 + 2 HCl = 2 NaCl + H2SiO3 ↓.
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