All preferences are stored on your device.
2011
It is built from checkable properties of the record itself: whether the article has a DOI, how many independent sources confirmed its data, whether the required fields are filled in, and how recent the latest confirmation is. Disagreement between sources and a missing identifier lower it. A value of 80 or above means the record was published without further checking; 60 to 79 means it is published at reduced confidence, with a manual check advisable. A record verified by an editor by hand is never pushed below 90 by a recalculation. This scores our data about the article, not the article itself.
The possible specified formulation: properties of chemical elements and their compound are in periodic dependence on periodically renewing (repeated) external electronic configuration (shells) of atoms at sequential increase of a nucleus charge of elements atom. Having designated the similar periods ( 1 – I; 2,3 – II; 4,5 – III and 6,7 – IV ) Pn, we offer mathematical expression PL: Z = 2 pn2(n = I; II; III; IV).