This video explains the periodic table, containing all the known elements arranged in groups and periods. Elements in the same group of the periodic table show trends in physical properties ...

Elements in group 1 and group 2 are metals ... See the study guide on groups in the periodic table for more information.

led Mendelejeff to assign it to Group III, along with B and Al. Consequently the oxide must have the formula InO3 and the atomic weight must be about 114. discrepances in the periodic table.

Electronegativity generally increases as you move from left to right across a period in the periodic table. It decreases as you move down a group. This means that the most electronegative elements are ...