An atom of an element x may be written as 9 4x
a) what does the number 9 indicate ?
what does the number 4 indicate ?
what is the number of protons in atom x?
d) what is the number of neutrons in atom x?
what is the number of electrons in atom x
how many electrons are there in the outermost shell

Why do leaves change color in the fall? green pigments break down and no longer mask the color of chlorophyll. chlorophyll breaks down and no longer masks the colors of other pigments. red- and yellow-colored pigments grow and mask green-colored chlorophyll. green-colored chlorophyll breaks down and turns red and yellow.

Which label correctly identifies what x represents in the concept map?

What problem would a person most likely have if her kidney did not work correctly?