Atomic Trends In The Periodic Table. First and second ionization energy. In this video we examine trends for three properties.
Periodic trends are specific patterns that are present in the periodic table that illustrate different aspects of a certain element including its size and its electronic properties. Below is a periodic table with arrows showing how atomic radii change to help you understand and visualize each atomic radius trend. However one can determine the valency of an element simply from its position in the periodic table.
Atoms decrease in size across the period and increase in size down the group.
This is because in going down a column you are jumping up to the next higher main energy level n and each energy level is further out from the nucleus - that is a bigger atomic radius. As you already know the valency of an atom is the number of electrons it has in its outermost shell or the number of atoms in requires to complete its outermost shell. Below is a periodic table with arrows showing how atomic radii change to help you understand and visualize each atomic radius trend. One of the trends in the modern periodic table is that of the valency of an atom.
