What is Mendelevium?

Mendelevium, the one hundred-first element on the periodic table, is a synthetic, radioactive actinide honoring the father of the periodic table.

Atomic Number: 101

Symbol: Md

Atomic Mass: [258] u (most stable isotope)

Category: Actinide

State at Room Temperature: Solid

Discovered By: Albert Ghiorso, Glenn T. Seaborg, et al. (1955)

⚛️ Atomic Structure of Mendelevium

Mendelevium has one hundred one protons, one hundred fifty-seven neutrons (in its most stable isotope, Mendelevium-258), and one hundred one electrons, with two in its outer shell.

  • 🟢 Protons: 101
  • 🔴 Neutrons: 157 (Most stable isotope, Mendelevium-258)
  • 🟡 Electrons: 101

💡 Did you know? Mendelevium was made by bombarding einsteinium with alpha particles, one atom at a time!

🔬 Mendelevium Properties

Mendelevium is radioactive, silvery, and dense. Its melting point is estimated at 827°C (1521°F), and it emits alpha radiation.

🧪 How Was Mendelevium Discovered?

In 1955, Albert Ghiorso, Glenn T. Seaborg, and a team synthesized Mendelevium by bombarding einsteinium-253 with helium ions at Berkeley.

⚡ Uses of Mendelevium

  • 🔬 Research: Studying actinide chemistry.
  • ⚡ Synthesis: Precursor to heavier elements.

💡 Fun Facts About Mendelevium

  • 👨‍🔬 Named after Dmitri Mendeleev.
  • ⏳ Half-life of 51.5 days.
  • 🔬 Made one atom at a time.
  • 🏭 Fully synthetic.

⚠️ Safety & Precautions

Mendelevium is radioactive and a radiation hazard. It's only handled in trace amounts in specialized labs.

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