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109 Mt Meitnerium 278

Meitnerium

UNKNOWN, PROBABLY TRANSITION METAL
Bohr Model: Electrons arranged in energy shells around the nucleus.

Meitnerium is a chemical element with symbol Mt and atomic number 109. It is an extremely radioactive synthetic element (an element not found in nature that can be created in a laboratory). The most stable known isotope, meitnerium-278, has a half-life of 7.6 seconds.

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Quick Facts

Atomic Number 109
Period 7
Group 9
Phase Solid
Appearance Unknown
About Unknown, Probably Transition Metals

Transition metals are elements with partially filled d-orbitals. They are hard, have high melting points, and often form colored compounds.

History

Discovered By Gesellschaft für Schwerionenforschung
Named By Unknown

Physical Properties

Atomic Mass 278
Density 37.4 g/L
Molar Heat N/A J/(mol·K)
Phase Transition (Melting & Boiling Points)

Meitnerium phase transition data is unavailable.

Atomic Properties

Electron Config *[Rn] 5f14 6d7 7s2
Electronegativity N/A
Electron Affinity N/A kJ/mol
Ionization Energy N/A kJ/mol
Orbital Filling Diagram
This diagram visualizes electron configuration according to the Aufbau principle and Hund's rule. Boxes represent orbitals (s, p, d, f), while arrows indicate electrons with spin up or down. Electrons fill lower energy levels first and occupy orbitals singly before pairing.

Photograph

Image of Meitnerium Source: Wikipedia

External Resources

Wikipedia PubChem Royal Society of Chemistry Periodic Videos (YouTube)

Study Guide

Atomic Number

The number of protons in the nucleus, which defines the element.

Atomic Mass

The average mass of an atom, including protons and neutrons.

Electronegativity

A measure of how strongly an atom attracts electrons in a bond.

Ionization Energy

The energy required to remove an electron from an atom.

Electron Config

The arrangement of electrons in the atom's energy shells.