Question

What are lanthanoids, transition,
inner transition, reprasantative​

Answer 1

$\bf {\pink{ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: lanthanoids}}$

The lanthanide or lanthanoid series of chemical elements comprises the 15 metallic chemical elements with atomic numbers 57–71, from lanthanum through lutetium. These elements, along with the chemically similar elements scandium and yttrium, are often collectively known as the rare earth elements.

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \bf {\pink{transition}}$

the process or a period of changing from one state or condition to another.

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \bf {\pink{inner \: transition}}$

Inner transition metals (ITM) are chemical elements on the periodic table. They are normally shown in two rows below all the other elements. They include elements 57-71, or lanthanides, and 89-103, or actinides. The lanthanides are very similar, and the actinides are all radioactive.

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \bf {\pink{reprasantative}}$

a person or thing that represents another or others. an agent or deputy: a legal representative. a person who represents a constituency or community in a legislative body, especially a member of the U.S. House of Representatives or a lower house in certain state legislatures.

Answer 2

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• The lanthanide or lanthanoid series of chemical elements comprises the 15 metallic chemical elements with atomic numbers 57–71, from lanthanum through lutetium. These elements, along with the chemically similar elements scandium and yttrium, are often collectively known as the rare earth elements.

• The transition state of a chemical reaction is a particular configuration along the reaction coordinate. It is defined as the state corresponding to the highest potential energy along this reaction coordinate. It is often marked with the double dagger ‡ symbol.

• Inner transition metals (ITM) are chemical elements on the periodic table. They are normally shown in two rows below all the other elements. They include elements 57-71, or lanthanides, and 89-103, or actinides. The lanthanides are very similar, and the actinides are all radioactive.

• In chemistry and atomic physics, the main group is the group of elements (sometimes called the representative elements) whose lightest members are represented by helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, and fluorine as arranged in the periodic table of the elements.