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Why are the atomic radii of lanthanum and its following elements in the same period almost the same?
Wiki User
∙ 11y ago
For the Lanthanide series electrons, which IF they are in an outer orbital may make a difference in atomic size. But these electrons are not added to the outer shell, nor to the next to last energy level, but are being added 2 levels inward, They just add more to the shielding effect not allowing the nucleuc to have a stronger attraction for the outer electrons. Thus not much effect on size.
Wiki User
∙ 11y ago
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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)
Elements with atomic numbers of 58 through 71 are known as the?
The elements beginning with Lanthanum (atomic number 57) and ending with Lutetium (atomic number 71) are called Lanthanides. They are also known as rare earth elements.
What are the 2 words that describe the classification of the 17 chemical elements with the numbers 57-71?
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)
What is the actinide with the smallest atomic number?
The lantanides (6f-block elements) start, after 57Lantanium, with atom number 58, Ce, to end with 71Lu
How many neutrons down lanthanum-141 have in its nucleus?
Lanthanum's atomic number is 57 thus it has 57 protons, the number of protons an atom has is equal to the atomic weight, in this case 141 minus the number of protons or 57 so, 141-57=84 Lanthanum-141 has 84 neutrons.
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)
What is the atomic number of lanthanum?
Lanthanum, with the chemical symbol La, is the chemical element with the atomic number 57.
Elements with atomic numbers of 58 through 71 are known as the?
The elements beginning with Lanthanum (atomic number 57) and ending with Lutetium (atomic number 71) are called Lanthanides. They are also known as rare earth elements.
What are the 2 words that describe the classification of the 17 chemical elements with the numbers 57-71?
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)
What are the atomic numbers from 58 to 71 called?
The elements with atomic numbers 58 to 71 are called Lanthanides or Lanthanoids. This literally means "Like Lanthanum". They are called this because they have similar characteristics to Lanthanum.
What is lanthanum's atomic radius?
187 picometers.
What is the examples of elements in the periodic table and their uses?
Elements: iron, nickel, uranium, astatine, lanthanum and the others up the atomic number 118. Fot the applications hundred of volumes can be writed !
What is the actinide with the smallest atomic number?
The lantanides (6f-block elements) start, after 57Lantanium, with atom number 58, Ce, to end with 71Lu
What is lanthanum atomic mass?
Im not sure about the atomic mass bit but Lanthanum is a silvery white, malleable, ductile, and soft rare-earth metal xx
What is the atomic mass of the element Lanthanum?
138.90547 amu
Is argon a rare earth element?
No, argon is not part of the group known as rare earth elements. Rare earth elements are a series of 15 elements known as the lanthanides, (atomic numbers 57 through 71 - lanthanum through lutetium) and include yttrium (atomic number 39) and scandium (atomic number 21). They fall under the category of metals. Argon is a gas.
What is a lanthanide element?
Lanthanides are any of the series of 15 consecutive chemical elements in the periodic table from lanthanum to lutetium (atomic numbers 57 - 71). With scandium and yttrium, they make up the rare earth metals. Their atoms have similar configurations and similar physical and chemical behaviour; the most common valences are 3 and 4.
