Atomic Number
24
Element 24
Chromium (Cr)
Chromium is a chemical element with symbol Cr and atomic number 24. It is the first element in group 6. It is a steely-grey, lustrous, hard and brittle transition metal.
Atomic Mass
51.996 u
Category
Transition Metal
Period
4
Group
Group 6: chromium group
Phase
solid
Density
7.15 g/cm3
Electron Shells
2, 8, 13, 1
Atomic Structure
Protons: 24. Electrons: 24. Neutrons: Varies by isotope.
Electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d⁵
Why Chromium Matters
Chromium helps connect atomic number 24, transition metal behavior, period 4 trends, and electron shell structure. Its solid phase, atomic mass of 51.996 u, and electron configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d⁵ make it useful for comparing bonding patterns across the periodic table.
Discovery and Occurrence
Chromium was discovered 1797 by Louis Nicolas Vauquelin. Chromium is a chemical element with symbol Cr and atomic number 24. It is the first element in group 6. It is a steely-grey, lustrous, hard and brittle transition metal.
Safety and Handling Context
Chromium is presented here for learning and comparison. Pure elements and laboratory compounds can have hazards that depend on dose, form, and setting.
Related Elements
Frequently Asked Questions
- What is the atomic number of Chromium?
- Chromium has atomic number 24, which means a neutral atom has 24 protons and 24 electrons.
- What is the chemical symbol for Chromium?
- The chemical symbol for Chromium is Cr.
- What category is Chromium in?
- Chromium is classified as a transition metal and sits in period 4 of the periodic table.
Explore Chromium in 3D
Use the interactive table above to rotate atomic models, compare periodic trends, and move from Chromium to neighboring elements without losing your place.