Atomic Number
36
Element 36
Krypton (Kr)
Krypton is a chemical element with symbol Kr and atomic number 36. It is a member of group 18 (noble gases) elements.
Atomic Mass
83.798 u
Category
Noble Gas
Period
4
Group
Group 18: noble gases
Phase
gas
Density
0.003733 g/cm3
Electron Shells
2, 8, 18, 8
Atomic Structure
Protons: 36. Electrons: 36. Neutrons: Varies by isotope.
Electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶
Why Krypton Matters
Krypton helps connect atomic number 36, noble gas behavior, period 4 trends, and electron shell structure. Its gas phase, atomic mass of 83.798 u, and electron configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ make it useful for comparing bonding patterns across the periodic table.
Discovery and Occurrence
Krypton was discovered 1898 by William Ramsay, Morris Travers. Krypton is a chemical element with symbol Kr and atomic number 36. It is a member of group 18 (noble gases) elements.
Safety and Handling Context
Krypton is a noble gas and is generally chemically inert. The main safety concern for many gases is displacement of breathable air in confined spaces.
Related Elements
Frequently Asked Questions
- What is the atomic number of Krypton?
- Krypton has atomic number 36, which means a neutral atom has 36 protons and 36 electrons.
- What is the chemical symbol for Krypton?
- The chemical symbol for Krypton is Kr.
- What category is Krypton in?
- Krypton is classified as a noble gas and sits in period 4 of the periodic table.
Explore Krypton in 3D
Use the interactive table above to rotate atomic models, compare periodic trends, and move from Krypton to neighboring elements without losing your place.