What is the atomic number of Mendelevium?

Mendelevium has atomic number 101, which means a neutral atom has 101 protons and 101 electrons.

What is the chemical symbol for Mendelevium?

The chemical symbol for Mendelevium is Md.

What category is Mendelevium in?

Mendelevium is classified as a actinide and sits in period 7 of the periodic table.

Element 101

Mendelevium (Md)

Mendelevium is a synthetic element with symbol Md and atomic number 101. A metallic radioactive transuranic element in the actinide series, it is the first element that currently cannot be produced in macroscopic quantities.

Atomic Number

101

Atomic Mass

258 u

Period

Group

Actinide series

Phase

solid

Density

10.3 g/cm3

Electron Shells

2, 8, 18, 32, 31, 8, 2

Atomic Structure

Protons: 101. Electrons: 101. Neutrons: Varies by isotope.

Electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f¹³

Why Mendelevium Matters

Mendelevium helps connect atomic number 101, actinide behavior, period 7 trends, and electron shell structure. Its solid phase, atomic mass of 258 u, and electron configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f¹³ make it useful for comparing bonding patterns across the periodic table.

Discovery and Occurrence

Mendelevium was discovered 1955 by Albert Ghiorso, Glenn T. Seaborg, Gregory R. Choppin, Bernard G. Harvey, Stanley G. Thompson. Mendelevium is a synthetic element with symbol Md and atomic number 101. A metallic radioactive transuranic element in the actinide series, it is the first element that currently cannot be produced in macroscopic quantities.

Safety and Handling Context

Mendelevium 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 Mendelevium?: Mendelevium has atomic number 101, which means a neutral atom has 101 protons and 101 electrons.
What is the chemical symbol for Mendelevium?: The chemical symbol for Mendelevium is Md.
What category is Mendelevium in?: Mendelevium is classified as a actinide and sits in period 7 of the periodic table.

Explore Mendelevium in 3D

Use the interactive table above to rotate atomic models, compare periodic trends, and move from Mendelevium to neighboring elements without losing your place.