What element has an atomic number of 57?

What element has an atomic number of 57?

Lanthanum – Element information, properties and uses | Periodic Table.

What is the mass of lanthanum 139 amu?

CHEBI:52627 – lanthanum-139 atom

ChEBI Name lanthanum-139 atom
Definition The stable isotope of lanthanum with relative atomic mass 138.906348, 99.9 atom percent natural abundance and nuclear spin 7/2.
Stars This entity has been manually annotated by the ChEBI Team.
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What is the mass of La 138?


PubChem CID 177687
Molecular Formula La
Synonyms Lanthanum-138 15816-87-2 LANTHANUM138 Lanthanum, isotope of mass 138 138La More…
Molecular Weight 137.907124
Dates Modify 2022-06-25 Create 2005-08-09

What is the density of lanthanum?

The density of lanthanum (atomic mass 138.90 daltons) is 6145kg/m3 and that of nickel (atomic mass 58.71 daltons) is 8902kg/m3.

Is LA a lanthanide?

Lanthanum is a chemical element with symbol La and atomic number 57. Classified as a lanthanide, Lanthanum is a solid at room temperature.

What element has a mass number of 139?

Cesium, isotope of mass 139.

How many protons does La 139 have?

Properties of Lanthanum-139 Isotope:

Properties of Lanthanum-139 Isotope: LANTHANUM-139
Atomic Number (Z) 57
Mass Number (A) 139
Nucleon Number (A) 139
Proton Number (Z) 57

How many protons and neutrons are in an atom of La 138?

Lanthanum-138 is composed of 57 protons, 81 neutrons, and 57 electrons.

How many atoms are in lanthanum?

Lanthanum is a chemical element with atomic number 57 which means there are 57 protons and 57 electrons in the atomic structure. The chemical symbol for Lanthanum is La. Since the number of electrons is responsible for the chemical behavior of atoms, the atomic number identifies the various chemical elements.

How many lanthanides are there?

15 elements
Abstract. The lanthanides (or lanthanons) are a group of 15 elements of atomic numbers from 57 through 71 in which scandium (atomic number 21) and yttrium (atomic number 39) are sometimes included.

Is lanthanum part of 5d or 4f?

Group group n/a
Period period 6
Block f-block
Electron configuration [Xe] 5d1 6s2

Who discovered lanthanides?

The Swede Carl Gustaf Mosander was a prolific early researcher, credited with the discovery of lanthanum, erbium and terbium, but he did much more than that. During the 19th century, the discovery of individual lanthanide elements was handicapped by the similarity of neighbouring elements in their chemical properties.

What is the neutron of La?

Electron configuration of Lanthanum is [Xe] 5d1 6s2. Possible oxidation states are +3….Summary.

Element Lanthanum
Number of protons 57
Number of neutrons (typical isotopes) 139
Number of electrons 57
Electron configuration [Xe] 5d1 6s2

How many protons neutrons and electrons does lanthanum 138 have?

What is lanthanide has the smallest atomic number?

Lanthanides being 14 in number ,starting from Z (58)- Ce(cerium ) to 71 (lutetium) So ,obviously Cerium has the smallest atomic number (Z) = 58. Hope its clear .

What is the lanthanide metal with the smallest atomic number?

the lanthanide series atoms, lutetium (atomic number 71) has the smallest atomic radius of and the last element in the lanthanide series. So ,obviously Cerium has the smallest atomic number (Z) = 58. Hope its clear . What is the element with the smallest atomic number? Helium is the smallest element, and francium is the largest.

What atom has the highest atomic number?

Oganesson has the highest atomic number and highest atomic mass of all known elements. The radioactive oganesson atom is very unstable, and since 2005, only five (possibly six) atoms of the isotope oganesson-294 have been detected.

What are the atomic numbers of the lanthanides?

Lanthanum: symbol Ln,atomic number 57

  • Cerium: symbol Ce,atomic number 58
  • Praseodymium: symbol Pr,atomic number 59
  • Neodymium: symbol Nd,atomic number 60
  • Promethium: symbol Pm,atomic number 61
  • Samarium: symbol Sm,atomic number 62
  • Europium: symbol Eu,atomic number 63
  • Gadolinium: symbol Gd,atomic number 64
  • Terbium: symbol Tb,atomic number 65
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