Which statement best describes relationships in a modern periodic table?
A)Each transition element is placed in the column of the main group element that it most closely resembles.
B)The fourteen elements in the "lanthanide" series form a new independent period.
C)Metalloids usually are the cations in ionic compounds.
D)Nonmetallic properties tend to predominate for elements at the far right portion of the table.
E)Elements are always arranged in order of increasing atomic weights.

Question

Quizplus · Accepted Answer

The modern periodic table arranges elements based on their electronic configuration and the trends in their properties. In general, nonmetallic properties tend to increase as one moves from left to right across a period. This trend is more pronounced for elements at the far right side of the table, such as the halogens and noble gases. Metalloids, which have properties intermediate between metals and nonmetals, can be found along the boundary between these two groups. The arrangement of elements in the periodic table is not based on atomic weight but on atomic number, which reflects the number of protons in the nucleus of an atom. There is no special period for the lanthanide series; these elements are typically placed at the bottom of the table to save space. Transition elements have unique properties that set them apart from main group elements, so they are generally placed in their own section of the table.

Which Statement Best Describes Relationships in a Modern Periodic Table