How many valence electron are contained in one atom of the element nitrogen

In the following redox reaction which is the oxidizing agent and which is the reducing agent? alcl3 + na nacl + al

According to each substances heat of fusion, which of the items below requires more heat to be added per gram of substance to go from solid to liquid? silver sulfur water lead

Pastoral farming is best described as a. a method of raising livestock and moving herds b. an african method of agriculture c. a method of cultivating crops on poor soils d. a common method of desert farming select the best answer from the choices provided a b c d