This year marks the 150th anniversary of the publication of Mendeleev’s Periodic Table of Chemical Elements in 1869. In celebration, the United Nations Educational, Scientific, and Cultural ...

The finished puzzle is a section of the periodic table, so the numbers on each tile are their atomic numbers - that means they increase from left to right and top to bottom. Another helpful clue ...

They can have different labels on the groups or numbers in the rectangles. However, the elements never move places. The periodic table's layout means we can make predictions about elements based ...

This leads us to ask an important question: Is there a maximum number of elements included in the periodic table? The answer may be no, and here’s why. For nearly a decade, the seventh period ...

Up until this point the atomic number simply referred to an element’s positioning in the periodic table, and was not known to correspond to a measurable physical quantity. Thanks to Moseley’s work it ...

If it has 7 protons, that’s nitrogen. But the logic of the periodic table also relies upon the number and organisation of electrons in an atom. Let’s take chlorine as an example. It is ...

The periodic table organizes chemical elements based on atomic weight, electron configurations, and chemical properties, ...

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