CHMA10H3 Lecture Notes - Lecture 22: Effective Nuclear Charge, Valence Electron, Core Electron
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CHMA10H3 Full Course Notes
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Order of assigning electrons to orbitals to achieve the ground-state configuration. 1s has lower energy than 2s bc 1s is closer to the nucleus. This is why they"re arranged this way, based on the distance from the nucleus. Particular chemical properties are attributed to the outermost (highest energy) electrons, those that are most likely to interact when atoms come close to each other. Atoms of elements in the same group have similar ground-state valence electron configurations. Differences come from the principal quantum number, but the valence are similar. The valence electrons of all the elements that belong to groups 1 and 2 occupy only s orbitals and these elements are called s-block elements. The elements in group 13-17 have partially filled p orbitals with valence electrons and, along with group 18, are called p-block elements. Valence electrons experience attraction with the nucleus but also repulsions from other electrons.
