However, some elements are capable of forming both cations and anions given the right conditions. One example is hydrogen, which may gain (H -) or lose (H +) an electron, forming hydride compounds ...

In the past 250 years, new elements have been added to the table about once every 2 ½ years on average, said Paul Karol of Carnegie Mellon University. He chaired the committee that recognized the ...

The same team that produced element 112 is also responsible for adding elements 107-111 to the periodic table. Sigurd Hofmann, who led the team at the Centre for Heavy Ion Research, has been ...

Mendeleev’s periodic table had three important features: He arranged the elements in order of increasing atomic mass. He put elements with similar properties in the same group.

Columns in the periodic table are called groups or families. Elements within the same group share similar properties because they have the same number of valence electrons (electrons in the ...

One in 5 Americans can't name a single element on the Periodic Table. Most Americans surveyed (59 percent) couldn't name more than 10 elements of the 118 that grace the Periodic Table.

Then along came Rutherford, Bohr, and Moseley, in the years 1911–1914, and scientists found that the place of an element on the periodic table (atomic number) was not just a voodoo hack-up, like ...

The short answer is: yes, elements have been removed from the periodic table. The longer answer is that what constitutes an 'element' can be complicated.

Metallic atoms hold some of their electrons relatively loosely. Consequently, they tend to lose electrons and form cations. Conversely, most nonmetallic atoms attract electrons more strongly than ...