It would be 1.55x10 to the 9th
hope that helps you
Answer:
I believe it is useful as it shows how electrons are distributed in the shells (energy levels) of an iron atom. An atom is the smallest particle of an element that can take part in a chemical reaction. It contains the nucleus and the shells (energy levels). the nucleus contains protons and neutrons while the shells contain electrons.
Explanation:
A model of an atom is important in understanding chemistry and in explaining the behavior of matter because it is the components of the atoms that gave rise to the different properties exhibited by the elements especially the electrons. From the model of the atom, we can predict the how would the elements or molecules behave or interact with each other. Also, it is the from the smallest unit of matter that we can actually see what is going on with the substance undergoing a particular process. You would see the arrangement of the subatomic particles and its effect on the overall structure.
B) Cytosine and guanine.
The pairs are A/T and C/G.