Atomic Number
109
Element 109
Meitnerium (Mt)
Meitnerium is a chemical element with symbol Mt and atomic number 109. It is named after physicist Lise Meitner. As a synthetic element, it can be created in a laboratory but is not found in nature.
Atomic Mass
278 u
Category
Unknown Classification
Period
7
Group
Group 9: cobalt group
Phase
Predicted solid
Density
~37.4 (predicted) g/cm3
Electron Shells
2, 8, 18, 32, 32, 15, 2
Atomic Structure
Protons: 109. Electrons: 109. Neutrons: Varies by isotope.
Electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f¹⁴ 6d⁷
Why Meitnerium Matters
Meitnerium helps connect atomic number 109, unknown classification behavior, period 7 trends, and electron shell structure. Its Predicted solid phase, atomic mass of 278 u, and electron configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f¹⁴ 6d⁷ make it useful for comparing bonding patterns across the periodic table.
Discovery and Occurrence
Meitnerium was discovered 1982 by Peter Armbruster, Gottfried Munzenberg. Meitnerium is a chemical element with symbol Mt and atomic number 109. It is named after physicist Lise Meitner. As a synthetic element, it can be created in a laboratory but is not found in nature.
Safety and Handling Context
Meitnerium has radioactive isotopes or is commonly discussed with radioactive materials. Use this page as an educational reference; real samples require qualified supervision and controlled handling.
Related Elements
Frequently Asked Questions
- What is the atomic number of Meitnerium?
- Meitnerium has atomic number 109, which means a neutral atom has 109 protons and 109 electrons.
- What is the chemical symbol for Meitnerium?
- The chemical symbol for Meitnerium is Mt.
- What category is Meitnerium in?
- Meitnerium is classified as a unknown classification and sits in period 7 of the periodic table.
Explore Meitnerium in 3D
Use the interactive table above to rotate atomic models, compare periodic trends, and move from Meitnerium to neighboring elements without losing your place.