If an atom has 12 protons, 13 neutrons, and 10 electrons, what is its mass number?

Describe the chemical reaction based on the chemical equation below. also, explain whether the equation is balanced.

Will mark brainliest how many electrons can be held in the energy level n = 4?

What effect would average population growth have on land usage? a. urban use of land would rise to more than 30 percent of available land. b. industrial use of land would rise to more than 30 percent of available land. c. the percentage of available land used as cropland would stay the same. d. cropland would fall to about 10 percent of available land.