and from down to up across a group, and metallic character (surrendering electrons to other atoms) increasing in the opposite direction. The underlying reason for these trends is electron ...

Discover who created the periodic table of elements and how it works. Learn about Dmitri Mendeleev’s contributions, its ...

Elements in group 1 and group 2 are ... The ions formed have a full outer electron shell, so are very stable. See the study guide on groups in the periodic table for more information.

Element 103 in the periodic table ... scandium and yttrium in group 3 of the periodic table. How can such disagreement still persist at the end of the first decade of the 21st century? The answer is ...