ARTICLES

The modern periodic table is arranged in ascending order according to atomic number. An element's atomic number is equal to the number of protons in each atom. Within this order, elements are arranged into distinct group...

www.reference.com/science/modern-periodic-table-arranged-35d8797115c66ba

The modern periodic table is based upon the atomic number and the physical properties of each element. The periods, or rows, are arranged by increasing atomic number. Each column, or group, of elements has similar physic...

www.reference.com/article/two-properties-modern-periodic-table-based-ceb8d12854d3b0bf

Henry Moseley's discovery of the atomic number refined the way elements are listed in the periodic table. Prior to his discovery, the elements were listed by atomic mass. Chemists considered the atomic numbers to be some...

www.reference.com/science/contribution-did-henry-moseley-make-periodic-table-2d189a9e61c5ef35

SIMILAR ARTICLES

"Rn" stands for radon in the periodic table. Radon's atomic number is 86, and its atomic weight is 222. Radon was originally called niton when it was discovered in 1900.

www.reference.com/article/rn-stand-periodic-table-fd916b113250f5e7

Some elements on the periodic table are oxygen, helium, arsenic and fluorine. Oxygen is an odorless, tasteless and colorless gas at room temperature, but is bright blue as a liquid. Oxygen is a very reactive element and ...

www.reference.com/article/elements-periodic-table-7f47a96a06c92b5e

A group on the periodic table is one of the vertical columns found on the table. The elements found in the same group all possess the same number of electrons in their outer orbital shell. These electrons are specificall...

www.reference.com/article/group-periodic-table-8293edc0811d0647

The periodic table was built to show the relationships among the various elements. The periodic table was constructed in 1869 by Dmitri Mendeleev.

www.reference.com/science/purpose-periodic-table-d700b1a10fb2035c