Question

how can you predict the placement of an unknown element on the periodic table based on its physical and chemical properties?

Answer 1

http://openstudy.com/study#/updates/50e1c6d6e4b0e36e3513ca0b

Answer 2

Elements are always nearby elements of similar, but still slightly different, properties. Groups, or families as they are called, of elements share the most similarities. Groups are vertical on the table. An example of similarity in a group is the alkali metals group, the furthest on the left. Comprised of Hydrogen (H), Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (Cs), and Francium (Fr), they all have 1 valence electron. This attribute causes all of them to react similarly and look similarly. They also all have somewhat similar melting and boiling points except for Hydrogen, which is a gas at room temperature, and therefore has very low melting and boiling points. They all react violently with water except hydrogen, the ferocity increasing as you go further down the table. Groups 1-8, the ones that seem to stand above the rest and start with Hydrogen (H), Beryllium (Be), Boron (B), Carbon (C), Nitrogen (N), Oxygen (O), Fluorine (F), and Helium (He) respectively have a number of valence electrons that corresponds with their group number. Also, the elements are placed in order of increasing atomic number, or the number of protons that the element contains as it goes across. This will be the most prominent number that you can see on just about any normal periodic table.