Scientists use the periodic table to quickly refer to information about an element, like atomic mass and chemical symbol. The periodic table’s arrangement also allows scientists to discern trends in ...

What are the units of molarity? The units of molarity are M or mol/L. A 1 M solution is said to be “one molar”. Two solutions that have the same molarity will have the same number of molecules of the ...

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. The atomic number of a ...

Mendeleev never received a Nobel Prize for his work, but element 101 was named Mendelevium after him, an even rarer distinction. It wasn’t until 1913, six years after Mendeleev’s death that the final ...

He took the 63 known elements and arranged them into a table, mainly by their atomic mass. Although he wasn't the first to do this, his interpretation involved a leap of ingenuity, in that he put ...

The nucleus of each atom contains protons and neutrons. While the number of protons defines the element (e.g., hydrogen, carbon, etc.) and the sum of the protons and neutrons gives the atomic mass, ...