CHEM.US

Basic Chemistry: The Periodic table of elements is a tabular arrangement of all known chemical elements, organized on the basis of their atomic numbers and internal configuration*, in the order of increasing electron number. Atomic number is a number of protons in the nucleus, electron configuration is the distribution (position) of electrons of an atom or molecule... Recurring chemical properties: Elements in periodic table are presented in order of increasing atomic number, which is typically listed with the chemical symbol in each box. The standard form of the table consists of a grid of elements laid out in 18 columns and 7 rows, with a double row of elements below that did not fit standard table format - Lanthanoids and Actinoids.