Question

Определите валентность химических элементов по формулам соединений: 1)Ba?HI; 2)Li2OII; 3)SiO2; 5)SiC.(пользуйтесь таблицей химических элементов Д.М.Менделеева)

Answer 1

1) якщо НІ, то Ва одновалентний;

2) літій одновалентний, оксиген двовалентний;

3) сіліцій чотирьохвалентний, оксиген дво; 

Answer 2

Valence of Chemical Elements in Compounds

To determine the valence of chemical elements in compounds, we can analyze the formulas of the compounds provided using the periodic table of chemical elements by Dmitri Mendeleev.

1) Ba?HI: The compound Ba?HI is not a recognized compound. It seems to be an incomplete or incorrect formula. Therefore, we cannot determine the valence of the elements in this compound.

2) Li2OII: The compound Li2OII is also not a recognized compound. It appears to have an incorrect formula. Therefore, we cannot determine the valence of the elements in this compound.

3) SiO2: The compound SiO2 represents silicon dioxide, commonly known as silica. In this compound, silicon (Si) has a valence of +4, and oxygen (O) has a valence of -2. The valence of an element represents its combining capacity or the number of electrons it can gain, lose, or share to form a chemical bond. In SiO2, silicon forms four covalent bonds with oxygen, with each oxygen atom sharing two electrons with the silicon atom.

5) SiC: The compound SiC represents silicon carbide. In this compound, silicon (Si) has a valence of +4, and carbon (C) has a valence of -4. Silicon forms four covalent bonds with carbon, with each carbon atom sharing two electrons with the silicon atom.

Please note that the valence of elements can vary depending on the compound they are part of. It is important to consider the specific compound when determining the valence of elements.

If you have any further questions, feel free to ask!