57 La Lanthanum 138.91 u

Lanthanum

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आवर्त
6
समूह
—
ब्लॉक
f-ब्लॉक
अवस्था (STP)
Solid

Lanthanum is the first element in the lanthanide series. It is used in camera lenses, catalysts, and battery electrodes.

About Lanthanum

The first element of the lanthanide series, lanthanum (La) gives the entire family of rare earths its name, from the Greek for to lie hidden. Element 57 falls in period 6 of the f-block, with an atomic mass of 138.91, the electron configuration [Xe] 5d¹ 6s², and a low Pauling electronegativity of 1.1. A soft, silvery, reactive metal, it is used in high-refractive-index optical glass for camera and telescope lenses, as a catalyst in petroleum refining, and in the electrodes of nickel-metal-hydride batteries. Lanthanum is solid at standard conditions and typically adopts the +3 state shared across the series.

भौतिक गुण

परमाणु द्रव्यमान 138.91 u
STP पर अवस्था Solid

इलेक्ट्रॉनिक गुण

विद्युतऋणात्मकता 1.1

इलेक्ट्रॉन विन्यास

विन्यास [Xe] 5d¹ 6s²

Electron Shell Configuration

Lanthanum electron shell configuration La 2e⁻ 8e⁻ 18e⁻ 18e⁻ 9e⁻ 2e⁻
Electron shell structure of Lanthanum — electrons per shell.
Shell Electrons
1 (K) 2
2 (L) 8
3 (M) 18
4 (N) 18
5 (O) 9
6 (P) 2

Position in Periodic Table

Lanthanum position in the periodic table La

ब्लॉक और आवर्त

ब्लॉक

s p d f

आवर्त

1 2 3 4 5 6 7

आवर्त सारणी

लैंथेनाइड एक्टिनाइड

Compounds Containing Lanthanum

Lanthanum Oxide

La₂O₃

लैंथेनाइड में और

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 67 Ho Holmium

Frequently Asked Questions

What is Lanthanum?
Lanthanum (La) is a chemical element with atomic number 57. It is a solid at standard temperature and pressure, classified as a लैंथेनाइड.
What are the key properties of Lanthanum?
Lanthanum has an atomic mass of 138.91 u.
What is the electron configuration of Lanthanum?
The electron configuration of Lanthanum is [Xe] 5d1 6s2. It is in the f-block of the periodic table.
What is the electronegativity of Lanthanum?
Lanthanum has an electronegativity of 1.1 on the Pauling scale.