What are the major social and political barriers to using solar energy?​

Plz choose one of the compounds from the table and explain how you know the numbers of atoms in your formula. is it possible for two different compounds to be made from the exact same two elements? why or why not? with a limited number of elements (less than 120 are known), does this mean we also have a small number of compounds or do we have a large number of compounds in this world?

Write a balanced equation showing the formation of copper (ii) nitrite from its elements

How many neutrons does an element have if its atomic number is 50 and its mass number is 166