Use the Sorting Tool activity to find another event in Earth’s history. Name the event and the period or eon in which the event occurred. Event:

Period/Eon:

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.

H tricky one let me think and get back to u