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Most, 99.91%, of the lanthanum found in nature is 139La, which is not radioactive. The other 0.09% is made up of 138La, which is radioactive but has a very long half life of 105,000,000,000 years. Like all elements, lanthanum has synthetic radioactive isotopes.

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How many protons neutrons and electrons are there in a neutral atom of the isotope of lanthanum named lanthanum-138?

Protons: Any atom of lanthanum has 57 protons. Neutrons: Lanthanum has 30 radioactive isotopes with neutron numbers ranging from 60 to 96 but the only stable isotope(139La) has 82 neutrons. Electrons: The number of electrons is normally the same as the number of protons.


Name an element that is stable by itself?

Examples (in the sense of non-radioactive): helium, oxygen, beryllium, caesium, lanthanum etc.


What series are called elements 57 to 70?

Elements from atomic number 57 (Lanthanum) to 71 (Lutetium) are called the Lanthanides. Lanthanide means "like Lanthanum" and so, the Lanthanides are based on Lanthanum. Only one of the Lanthanides is radioactive: Promethium (Pm - No. 61)


Is lanthanum an alloy?

Lanthanum is not an allot.


What good slogan for the element lanthanum?

what is a good slogan for Lanthanum


Are all rare earth elements radioactive?

All rare earth elements except promethium have at least one stable isotope.Natural-abundance samples of lanthanum, cerium, neodymium, samarium, europium, gadolinium, erbium, ytterbium, and lutetium are all technically "radioactive" in that they contain measurable amounts of radionuclides, but the half-lives of these nuclides are mostly in the hundreds of millions of years or longer (in some cases much longer).


What is a man-made lanthanum element?

Lanthanum is a natural element.


What is the oxidation number for lanthanum?

The oxidation number for lanthanum is +3.


What temperature does lanthanum boil?

The Boiling point of lanthanum:


How much valence elections does lanthanum have?

Lanthanum has 3 valence electrons


How many valence electron does lanthanum have?

Lanthanum has 2 valence electrons.


What ion s formed by lanthanum?

The cation of lanthanum is La(3+).