How many moles are contained in 70.0 mL of NH3 at STP?

668900 atoms in total

Both models are effective because they show the valence electrons, and these valence electrons indicate the reactivity of an element.

Order of filling levels and sublevels of electrons: 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s²3f¹⁴5d¹⁰6p⁶for an element with 5 electrons in the 3d energy level: full configuration: 1s²2s²2p⁶3s²3p³.