Question

What are lantinides?

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Answer 1

Answer:

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.

Answer 2

Answer:

lanthanides

any of the series of fifteen metallic elements from lanthanum to lutetium in the periodic table (atomic numbers 57–71).

Explanation:

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

Lanthanides share the following common properties:

Silvery-white metals that tarnish when exposed to air, forming their oxides.

Relatively soft metals. ...

Moving from left to right across the period (increasing atomic number), the radius of each lanthanide 3+ ion steadily decreases. ...

High melting points and boiling points.