An atom has 21 electrons, 17 protons and 18 neutrons. What is the total charge of the atom?

i dont know but

explanation:

whoever your teacher is, deserves a raise for using pokemon as an example

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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