Now consider an excited state hydrogen atom. what is the energy of the electron in the n= 2 level

What is a metal replacement reaction

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?

Ants live on acacia trees in south america. the ants feed on sugars secreted by the trees. the trees provide room for the ants to live. the ants sting any other insect or animal that comes to eat the trees. what type of relationship is this?