Fill in the blanks:
$1.$ In the elements of the actinoid series,the last electron enters the ........... orbitals.
$2.$ Inner transition elements are the elements of the .......... series.
$3.$ If electrons are filled in the $5f$ series,those elements are called ....... elements.
$4.$ Many elements of the actinoid series are ......... .
$1.$ In the elements of the actinoid series,the last electron enters the ........... orbitals.
$2.$ Inner transition elements are the elements of the .......... series.
$3.$ If electrons are filled in the $5f$ series,those elements are called ....... elements.
$4.$ Many elements of the actinoid series are ......... .
(N/A) $1.$ The last electron in actinoids enters the $5f$ orbitals.
$2.$ Inner transition elements are the elements of the $f$-block series.
$3.$ Elements in which the $5f$ orbitals are being filled are called actinoids.
$4.$ Many elements of the actinoid series are radioactive.
$2.$ Inner transition elements are the elements of the $f$-block series.
$3.$ Elements in which the $5f$ orbitals are being filled are called actinoids.
$4.$ Many elements of the actinoid series are radioactive.
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