69 Tm Thulium 168,93 u

Thulium

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الدورة
6
المجموعة
—
الكتلة
f-كتلة
الطور (STP)
Solid

Thulium is the least abundant lanthanide in Earth's crust. It is used in portable X-ray devices and solid-state lasers.

About Thulium

The least abundant lanthanide in Earth's crust, thulium (Tm) is among the rarest of the rare earth elements. Element 69 sits in period 6 of the f-block, with an atomic mass of 168.93, the electron configuration [Xe] 4f¹³ 6s², and a Pauling electronegativity of 1.25. When irradiated in a reactor, one of its isotopes emits X-rays, which allows thulium to serve as the radiation source in compact, portable X-ray devices. The element also appears in certain solid-state and fiber lasers. A soft, silvery metal, thulium is solid at standard conditions.

الخصائص الفيزيائية

الكتلة الذرية 168.93 u
الطور عند STP Solid

الخصائص الإلكترونية

الكهروسالبية 1.25

التوزيع الإلكتروني

التهيئة [Xe] 4f¹³ 6s²

Electron Shell Configuration

Thulium electron shell configuration Tm 2e⁻ 8e⁻ 18e⁻ 31e⁻ 8e⁻ 2e⁻
Electron shell structure of Thulium — electrons per shell.
Shell Electrons
1 (K) 2
2 (L) 8
3 (M) 18
4 (N) 31
5 (O) 8
6 (P) 2

Position in Periodic Table

Thulium position in the periodic table Tm

الكتلة والدورة

الكتلة

s p d f

الدورة

1 2 3 4 5 6 7

الجدول الدوري

اللانثانيدات الأكتينيدات

المزيد من لانثانيد

57 La Lanthanum 58 Ce Cerium 59 Pr Praseodymium 60 Nd Neodymium 61 Pm Promethium 62 Sm Samarium 63 Eu Europium 64 Gd Gadolinium 65 Tb Terbium 66 Dy Dysprosium

Frequently Asked Questions

What is Thulium?
Thulium (Tm) is a chemical element with atomic number 69. It is a solid at standard temperature and pressure, classified as a لانثانيد.
What are the key properties of Thulium?
Thulium has an atomic mass of 168.93 u.
What is the electron configuration of Thulium?
The electron configuration of Thulium is [Xe] 4f13 6s2. It is in the f-block of the periodic table.
What is the electronegativity of Thulium?
Thulium has an electronegativity of 1.25 on the Pauling scale.