Assertion: series's period | /r/HasProperty | horizontal row
Facets:
value: in the periodic table
type: LOCATION
Source sentences:
text: period: A horizontal row in the periodic table, which signifies the total number of electron shells in an element’s atom.
text: The modern periodic table consists of 7 periods ( horizontal rows ) , 18 groups ( vertical columns ) , The elements are arranged ascendingly according to their atomic numbers and the way to fill their atomic energy sublevels by electrons according to the Aufbeau ( building-up ) principle , where each element has one electron more than the element preceds it .
text: A period is a horizontal row in the periodic table.