The periodic table brought solidity to a field of inquiry that had long been squishy. Sir Isaac Newton, in Query 31, a section in his 1717 work “Opticks,” listed and ranked chemical compounds ...

The periodic table traditionally taught in textbooks, which organizes elements based on chemical traits such as reactivity, places helium in the rightmost column with the other less reactive elements.

The table gets its shape from the properties of the elements, like relative weight, conductivity and reactivity. It's true today, as it was in Mendeleev's time.

The periodic table of elements, devised by Russian chemist Dmitri Mendeleev, is a two-dimensional array of the chemical elements, ordered by atomic number and arranged 18 across by orbitals.

Elements heavier than uranium don’t exist naturally on Earth. Researchers make these massive elements at the end of the periodic table by smashing existing atoms together in particle ...

The specific arrangement of Group 1 elements on the periodic table allows us to make predictions about their reactivity. For example: Lithium (Li) reacts quickly with water.

Redesigning the periodic table might seem a quixotic quest, but it could soon take on a new urgency. We are already on the trail of element 119 . Where it will go, and how the table will morph to ...

The periodic table of chemical elements, often called the periodic table, organizes all discovered chemical elements in rows (called periods) and columns (called groups) according to increasing atomic ...

The periodic table of elements is a landmark categorization developed in 1869 by the Russian chemist and inventor Dmitri Mendeleev. It arranges all natural and synthetic elements by their atomic ...