February 7 is National Periodic Table Day, when we celebrate the efforts of scientists over the centuries to figure out how different elements ...

This video is an interactive lesson in calculating an atom’s mass and atomic number. Atoms consist of a nucleus containing protons and neutrons, surrounded by electrons in shells. The numbers of ...

Ever since physicist Ernest Rutherford discovered the atomic nucleus in 1911, studying its structure and behavior has ...

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and since the mass of the beta particle is extremely small compared with that of the atom, there is practically no decrease in atomic weight. Now in the Periodic Table the valency for oxygen ...

Nuclear power is going through a bit of a renaissance as developed countries look for sources of cheap, plentiful energy to ...

Naturally not all of them are of equal importance, about 14 are of great general interest, as forming the greater part of the mass ... or periodic system of the elements. The periodic table ...

How do we calculate mass and atomic numbers? VideoHow do we calculate mass and atomic numbers? This video is an interactive lesson in calculating an atom's mass and atomic number.

Ever since physicist Ernest Rutherford discovered the atomic nucleus in 1911, studying its structure and behavior has ...

Tungsten, with the chemical symbol W and atomic number 74, is located in the sixth period and group VIB of the periodic table. It possesses exceptionally outstanding physical properties, including a ...