מאפיינים

CAS Number7440-34-8
PubChem CIDna
רדיוס אטומי-
Atomic Volume22.54
מסה אטומי[227]
חסוםf
נקודת רתיחה3,198
Bulk Modulus
קטגוריהאקטינידים
מבנה גבישיממורכז פאה קובי
צבעכסף
רדיוס קוולנטי215
צפיפות החומר10.07
Electrical Resistivity
מבנה אלקטרוני[Rn] 6d1 7s2
Electrons per shell2, 8, 18, 32, 18, 9, 2
אלקטרושליליות1.1
Electrons89
קבוצהna
Heat of Fusion14
Heat of Vaporization400
Ionization Potential5.17
Magnetic Ordering
Magnetic Susceptibility
מסה[227]
Mass Number89
נקודת התכה1,050
שםאקטיניום
ניוטרונים138
מספר אטומי227
Oxidation States3
מחזור7
פאזהמוצק
Poisson Ratio
פרוטונים89
Shear Modulus
קיבול חום סגולי0.12
סמל כימיAc
מוליכות חום0.12
Van der Waals radius
Young's Modulus
שכיחות
Abundance in Earth's crustna
Abundance in Universena
Ac אקטיניום 89 (227) 3 7 f 89 1050.0 3200.0 [Rn] 6d1 7s2 2 8 18 32 18 9 2 10.1 N/A Silver Cubic: Face centered 1.1 {"1":"499","2":"1170"} 499 3 1.88 22.5 0.12 12.0 1 21.7865 y 31.4311y BetaDecay Solid, Actinide, Radioactive, Natural ak-TIN-i-em Heavy, silvery-white, very radioactive metal It has no significant commercial applications. Extremely rare, found in all uranium ores. Usually obtained by treating radium with neutrons in a reactor. 0BlpjWBYW0k Actinium
Tantalum was discovered in Sweden in 1802 by Anders Ekeberg in the minerals tantalite from Finland and yttrotantalite from Sweden.

Unfortunately, William Hyde Wollaston claimed Ekeberg's new element was actually niobium, which had also been discovered in 1802.

In 1846, German chemist Heinrich Rose finally proved beyond doubt that tantalum and niobium were different elements. Named after Tantalos, a Greek mythological character, father of Niobe 89 1899 Andre Debierne France From the Greek word "aktinos" meaning "ray"

Isotopes of Tantalum

Standard Atomic Weight

[227]

איזוטופים יציבים

איזוטופים לא יציבים

206Ac 207Ac 208Ac 209Ac 210Ac 211Ac 212Ac 213Ac 214Ac 215Ac 216Ac 217Ac 218Ac 219Ac 220Ac 221Ac 222Ac 223Ac 224Ac 225Ac 226Ac 227Ac 228Ac 229Ac 230Ac 231Ac 232Ac 233Ac 234Ac 235Ac 236Ac

Tantalum is considered to be non-toxic
Tantalum occurs principally in the mineral columbite-tantalite
Tantalum is used in the electronics industry for capacitors and high power resistors.

The high melting point and oxidation resistance lead to the use of the metal in the production of vacuum furnace parts.

Tantalum oxide is used to make special glass with high index of refraction for camera lenses.