Question

Визначте валентність атомів хімічних елементів за формуламисполук: РН3 ; К2О ; СаО; Пжпжпжпжпжпжп... ПожалуйстаПобыстрее......Кто знает химию.... ​

Answer 1

Ответ:Надеюсь я правильно поняла¿

Объяснение:

РН3; Н -1, Над Р ставим х. -> х+3×(-1)=0 х=+3

К2О; О -2, Над К ставим х. ->х×2-2=0 х=+1

СаО; О -2, Над Са ставим х. ->х-2=0 х=+2

Answer 2

Valence of Atoms in Chemical Compounds

The valence of an atom in a chemical compound refers to the number of electrons that an atom can gain, lose, or share to form chemical bonds with other atoms. It determines the atom's ability to combine with other atoms to form compounds.

Let's determine the valence of the atoms in the given chemical compounds:

1. PH3 (Phosphine): - Phosphine (PH3) is a compound composed of one phosphorus atom (P) and three hydrogen atoms (H). - Phosphorus is in Group 15 of the periodic table, which means it has 5 valence electrons. - Hydrogen is in Group 1 of the periodic table, which means it has 1 valence electron. - In PH3, phosphorus shares its 3 valence electrons with 3 hydrogen atoms, forming covalent bonds. - Therefore, the valence of the phosphorus atom in PH3 is 3.

2. K2O (Potassium Oxide): - Potassium oxide (K2O) is a compound composed of two potassium atoms (K) and one oxygen atom (O). - Potassium is in Group 1 of the periodic table, which means it has 1 valence electron. - Oxygen is in Group 16 of the periodic table, which means it has 6 valence electrons. - In K2O, each potassium atom donates one valence electron to oxygen, forming an ionic bond. - Therefore, the valence of the potassium atom in K2O is 1.

3. CaO (Calcium Oxide): - Calcium oxide (CaO) is a compound composed of one calcium atom (Ca) and one oxygen atom (O). - Calcium is in Group 2 of the periodic table, which means it has 2 valence electrons. - Oxygen is in Group 16 of the periodic table, which means it has 6 valence electrons. - In CaO, calcium donates its 2 valence electrons to oxygen, forming an ionic bond. - Therefore, the valence of the calcium atom in CaO is 2.

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