Does nonmetallic character increase or decrease with increasing atomic number down a group?

A number in parentheses indicates the uncertainty in the last digit of the atomic weight. See below for the elements listed in Atomic Number Order or Name order ... Independent: · atom – the smallest unit of an element that maintains the properties of that element · atomic number – the number of protons in the nucleus of an ... noun : an experimentally determined number characteristic of a chemical element that represents the number of protons in the nucleus This study aimed to quantitate the accuracy of the determination of electron density (ED), effective atomic number (Z eff ), and iodine concentration Aug 9, 2019 ... Some of the conventionally best shielding materials, such as lead, at intermediate energies have the lowest mass attenuation coefficient when compared to ... For ordinary nuclei composed of protons and neutrons, this is equal to the proton number (np) or the number of protons found in the nucleus of every atom of ... Mar 27, 2023 ... Atomic number is the number of protons. Atomic weight is the weighted averages of the isotopes. Mass number and atomic mass is the same and that's just the ... The IUPAC Compendium of Chemical Terminology. Complete and detailed technical data about the element $$$ELEMENTNAME$$$ in the Periodic Table. Lithium fluoride thermoluminescent dosimeters (TLD) are the most commonly implemented for clinical dosimetry. The small physical magnitude of TLDs makes ...