Last year, the International Union of Pure and Applied Chemistry (Iupac) revised the atomic weights of gadolinium, lutetium ...

Atomic Number and Atomic Mass: Get here the easy notes on atomic number and atomic mass for all the first 30 elements. Know how to calculate atomic mass using atomic number.

The atoms of each element in the periodic table have different number of protons, and hence different atomic number. In fact, the periodic table is arranged in order of increasing atomic number.

Atoms of different elements usually have different mass numbers, but they can be the same. For example, the mass number of argon atoms and calcium atoms can both be 40.

Keith Enevoldsen // CC BY-SA 4.0 Enevoldsen’s table can also be used to study other facts, like each element’s atomic number and material state (solid, liquid, or gas).

Nobelium — element number 102 on the periodic table — has an atomic nucleus that is deformed into the shape of an American football, scientists report in the June 8 Physical Review Letters.

Molar Mass of Elements: Get here the concept of molar mass and the key differences between molar mass and percent composition, providing a clear understanding of their distinct roles and ...

In a transparent medium, each photon is accompanied by an atomic mass density wave, scientists can demonstrate. The optical force of the photon sets the medium atoms in motion and makes them carry ...