Question

The elements in which the electrons are progressively filled in 5f-orbitals are called

Answer 1

Answer:

Its of 4f : Lanthanides

Answer 2

Answer:

The identification of the 5th orbitals elements are made as actinides. This fill the 5f progressively.

Explanation:

• The elements in the actinides series ranges from 89 to 103.
• The fifteen elements ranging and starting from 89 actinium and 103 lawrencium.
• These elements has the radioactive property and these are heavier and then others. These elements are unstable in their properties.
• It does not have stable isotopes. These elements are highly electro positive. These have discrete structure in their definition and it doesn't naturally exist.