GROUP 7: MANGANESE GROUP

Manganese Group Overview

Also known as: Manganese family

Group Members: Manganese (Mn), Technetium (Tc), Rhenium (Re), Bohrium (Bh)

Common Properties: All are transition metals, form +7 oxidation state, high melting points, paramagnetic

Mn

Manganese

Essential
Atomic Number 25
Atomic Mass 54.94 u
Electron Config [Ar] 3d⁵ 4s²
Common Ions Mn²⁺, Mn⁴⁺, Mn⁷⁺
Melting Point 1246°C
Density 7.21 g/cm³
Manganese is essential for life and is found in enzymes that protect cells from damage!

Properties: Brittle, silvery-gray, paramagnetic, essential nutrient

Applications: Steel production, batteries, fertilizers, pigments, animal feed

Drag to rotate • Scroll to zoom
Tc

Technetium

Radioactive
Atomic Number 43
Atomic Mass 98 u
Electron Config [Kr] 4d⁵ 5s²
Common Ions Tc⁴⁺, Tc⁷⁺
Melting Point 2157°C
Density 11.5 g/cm³
Technetium was the first artificially produced element and its name means "artificial"!

Properties: Radioactive, silvery-gray, crystalline, synthetic

Applications: Medical imaging, radioactive tracer, corrosion inhibitor

Drag to rotate • Scroll to zoom
Re

Rhenium

High Density
Atomic Number 75
Atomic Mass 186.21 u
Electron Config [Xe] 4f¹⁴ 5d⁵ 6s²
Common Ions Re⁴⁺, Re⁶⁺, Re⁷⁺
Melting Point 3186°C
Density 21.02 g/cm³
Rhenium has the third highest melting point of all elements after tungsten and carbon!

Properties: Very dense, high melting point, wear-resistant

Applications: Jet engine parts, catalysts, thermocouples, electrical contacts

Drag to rotate • Scroll to zoom
Bh

Bohrium

Synthetic
Atomic Number 107
Atomic Mass 270 u
Electron Config [Rn] 5f¹⁴ 6d⁵ 7s²
Common Ions Bh⁷⁺
Half-life ~61 sec
Stability Synthetic
Bohrium is named after Niels Bohr, the Nobel Prize-winning physicist!

Properties: Synthetic radioactive metal, extremely short-lived

Applications: Scientific research only

Drag to rotate • Scroll to zoom