Technetium's Periodic Table Group Explained

Technetium (Tc) holds a unique place in chemistry as the first artificially produced element. Its significance is further highlighted by its widespread application in medical diagnostic imaging scans.

Understanding Periodic Table Groups

The periodic table organizes elements based on their atomic structure and recurring chemical properties. Elements are arranged in columns known as groups. Elements within the same group typically share similar characteristics because they have the same number of valence electrons.

Locating Technetium (Tc) in the Periodic Table

Technetium has the atomic number 43. As a member of the d-block, it is classified as a transition metal.

To determine the group number for transition metals like Technetium, we examine its electron configuration. The ground state electron configuration of Technetium is [Kr] 4d⁵5s².

The group number for these elements is often calculated by summing the electrons in the outermost shell (ns) and the electrons in the penultimate d shell ((n-1)d). For Technetium:

• Number of electrons in the 5s subshell = 2
• Number of electrons in the 4d subshell = 5
• Total electron count = 2 + 5 = 7

This calculation places Technetium firmly in Group 7.

Group 7 Elements

Group 7 is part of the transition metals series and contains elements such as Manganese (Mn), Technetium (Tc), and Rhenium (Re).

Analysis of Provided Options

The question asks for the group number where Technetium is found. Considering its electron configuration and position:

• Option 1: Group 7 - Matches the calculated group based on electron configuration.
• Option 2: Group 12
• Option 3: Group 14
• Option 4: Group 19 (Note: The periodic table is conventionally numbered up to Group 18)

Based on established chemical principles and the structure of the periodic table, Technetium belongs to Group 7.