101
Md
258
Mendelevium (Md)
Element 101 · Period 7 · Actinide series
actinide
solid at room temp
f-block
radioactive
synthetic
About Mendelevium
Named after the creator of the periodic table. Produced atom by atom.
Physical Properties
Atomic Mass
258 u
State at 25°C
Solid
Melting Point
827 °C
Magnetism
Paramagnetic
Atomic Properties
Electron Configuration
[Rn] 5f¹³ 7s²
Electron Shells
2, 8, 18, 32, 31, 8, 2
Electronegativity
1.3
Atomic Radius
246 pm
Ionization Energy
635 kJ/mol
Oxidation States
+2, +3
Discovery & History
Discovered By
Albert Ghiorso
Discovery Year
1955
Named By
Albert Ghiorso
Name origin: Dmitri Mendeleev
Frequently Asked Questions
- Is Mendelevium a metal, nonmetal, or metalloid?
- Mendelevium is classified as a actinide.
- What state is Mendelevium in at room temperature?
- Mendelevium is a solid at standard room temperature (25°C).
- What is the atomic mass of Mendelevium?
- Mendelevium has an atomic mass of 258 atomic mass units (u).
- Who discovered Mendelevium?
- Mendelevium was discovered by Albert Ghiorso in 1955.
- Where is Mendelevium on the periodic table?
- Mendelevium is element number 101, located in period 7, part of the actinide series shown below the main table.