![]() As a result, the attraction between the nucleus and the valence. More electron shells are added moving down a group, so the outermost electron becomes increasingly distance from the nucleus. With the addition of more electrons and corresponding energy levels, the atomic radius expands. ![]() There are more protons in atoms moving down a group (greater positive charge), yet the effect is to pull in the electron shells, making them smaller and screening outer electrons from the attractive force of the nucleus. This is because the principal quantum number of the outermost electron increases moving down a group. Ionization decreases moving top to bottom down an element group (column). Remember You have the valence electrons for the representative elements in your periodic table families/groups foldable.The noble gas has a filled valence shell, so it resists electron removal. If you consider the electronic configuration of an atom of each element in the Periodic Table you will see a number of patterns which are referred to as periodic trends, or just trends. Electronic configuration is also referred to as electron configuration. Ionization is at its minimum value for the alkali metal on the left side of the table and a maximum for the noble gas on the far right side of a period. Trends in Electronic Configuration Chemistry Tutorial. Zeff Z e f f can be calculated by subtracting the magnitude of shielding from the total nuclear charge and the effective nuclear charge of an atom is given by the equation: Zeff Z S (7.6.1) (7.6.1) Z e f f Z S. This is because the atomic radius generally decreases moving across a period, so there is a greater effective attraction between the negatively charged electrons and positively-charged nucleus. Hence, the nucleus has 'less grip' on the outer electrons insofar as it is shielded from them. periodic table, commonly loses one electron, which allows it to fill its valence. Ionization energy generally increases moving from left to right across an element period (row). trends among the elements in the periodic table, including the atomic radius.
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