If you build an atom using two protons two neutrons and two electrons you have built an atom of

Helium atom because two of everything is a helium

explanation:

crosscutting concepts have application across all domains of science. as such, they are a way of linking the different domains of science. they include patterns; cause and effect; scale, proportion, and quantity; systems and system models; energy and matter; structure and function; and stability and change.