Explain how you can determine which column and row an element can be found in

An atom of lithium-7 has an equal number of(1) electrons and neutrons(2) electrons and protons(3) positrons and neutrons(4) positrons and protons

Amixture that has two or more substances that are spread out evenly is called a. compound b. heterogeneous c. substance d. homogeneous

50 points! need answer asap. what type of organic compound contains the following functional group? (2 points)