As in DNA replication, RNA is synthesized in the 5' â 3' direction (from the point of view of the growing RNA transcript). Only one of the two DNA strands is transcribed. This strand is called the template strand, because it provides the template for ordering the sequence of nucleotides in an RNA transcript.
The properties of the chemical elements are summarized on the periodic table, which organizes the elements by increasing atomic number into rows (periods) in which the columns (groups) share recurring (periodic) physical and chemical properties.
The Periodic Table is an arrangement of the elements in order of atomic number. Columns in the table - groups. The elements in any one vertical column are said to be in the same group or family. Eight of the groups are numbered from left to right. Elements in the same group have similar chemical properties. The group number is the same as the number of electrons in the outer shell of all the elements in the group.