GROUP 6: CHROMIUM GROUP

Chromium Group Overview

Also known as: Chromium family

Group Members: Chromium (Cr), Molybdenum (Mo), Tungsten (W), Seaborgium (Sg)

Common Properties: All are transition metals, form +6 oxidation state, high melting points, hard and refractory metals

Cr

Chromium

Hard Metal
Atomic Number 24
Atomic Mass 52.00 u
Electron Config [Ar] 3d⁵ 4s¹
Common Ions Cr³⁺, Cr⁶⁺
Melting Point 1907°C
Density 7.19 g/cm³
Chromium gives rubies their red color and emeralds their green color!

Properties: Hard, silvery, corrosion-resistant, lustrous

Applications: Stainless steel, chrome plating, pigments, leather tanning

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Mo

Molybdenum

Heat Resistant
Atomic Number 42
Atomic Mass 95.95 u
Electron Config [Kr] 4d⁵ 5s¹
Common Ions Mo⁴⁺, Mo⁶⁺
Melting Point 2623°C
Density 10.28 g/cm³
Molybdenum has the 6th highest melting point of any element!

Properties: High strength, heat-resistant, good conductor

Applications: Steel alloys, lubricants, electrodes, missile parts

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W

Tungsten

Highest MP
Atomic Number 74
Atomic Mass 183.84 u
Electron Config [Xe] 4f¹⁴ 5d⁴ 6s²
Common Ions W⁴⁺, W⁶⁺
Melting Point 3422°C
Density 19.25 g/cm³
Tungsten has the highest melting point of all metals - 3422°C!

Properties: Highest melting point, extremely dense, strong

Applications: Light bulb filaments, armor-piercing rounds, weights, welding

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Sg

Seaborgium

Synthetic
Atomic Number 106
Atomic Mass 269 u
Electron Config [Rn] 5f¹⁴ 6d⁴ 7s²
Common Ions Sg⁶⁺
Half-life ~2.4 min
Stability Synthetic
Seaborgium is named after Glenn T. Seaborg, Nobel Prize winner in chemistry!

Properties: Synthetic radioactive metal, very short-lived

Applications: Scientific research only

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