Question

как узнать оксиды?их валентность и ещё раядом цифры как узнать?

Answer 1

Оксиды- бинарные соединения, один из которых обязательно кислород(О)

валентность кислорода постоянная-II, 

в соединениях индексы могут быть разными!

как уже было сказано, на втром месте стоит кислород

Answer 2

How to Determine Oxides, Their Valence, and Nearby Numbers?

To determine oxides, their valence, and nearby numbers, you can follow these steps:

1. Understand Oxides: Oxides are compounds composed of oxygen and another element. They can be classified as acidic, basic, or amphoteric, depending on their chemical properties.

2. Identify the Element: Determine the element for which you want to find the oxide and its valence. For example, if you want to find the oxide of sulfur, the element is sulfur.

3. Determine the Valence: The valence of an element represents the number of electrons it gains, loses, or shares when it forms a compound. To determine the valence of an element, you can refer to the periodic table or use the common valence rules. For example, sulfur typically has a valence of -2.

4. Combine with Oxygen: Once you know the valence of the element, combine it with oxygen to form the oxide. The valence of oxygen is usually -2. Use the valence of the element to balance the charges. For example, if sulfur has a valence of -2, it combines with two oxygen atoms to form sulfur dioxide (SO2).

5. Check Nearby Numbers: To determine nearby numbers, you can refer to the periodic table or consider the elements in the same group or period. Nearby numbers can provide insights into the chemical properties and trends of elements. For example, sulfur is in Group 16, so elements like selenium (Se) and tellurium (Te) are nearby.

Remember, the valence and nearby numbers may vary depending on the specific element and its chemical properties. It's always a good idea to consult reliable sources or reference materials for accurate and detailed information.

I hope this helps! Let me know if you have any more questions.