How many atoms of a chlorine element would be needed to react with one atomic of helium

Question: How many atoms of a chlorine element would be needed to react with one atom of helium?

So... for the element of CHLORINE, you already know that the atomic number tells you the number of electrons. That means there are 17 electrons in a chlorine atom. Looking at the picture, you can see there are two electrons in shell one, eight in shell two, and seven in shell three.

Hope this helps!.

~A.W~ZoomZoom44