Question

Give the names of the elements from the category $21\mathrm{to}30$?

Answer 1

Atomic number $21\mathrm{to}30$:

• These elements are placed in the period $4\mathrm{th}$of the periodic table.
• These elements come under D lock elements in the periodic table.
• They are also called transition elements.
• According to IUPAC, a transition element is an element with a partially full d subshell of electrons or an element with a partially filled d orbital that can form stable cations.

$3\mathrm{d}$ Series:-

• The $3\mathrm{d}$ transition series starts from Scandium $\left(\mathrm{Sc}\right)$ whose atomic number is $21$ after Calcium $\left(\mathrm{Ca}\right)$ whose atomic number is $20$.
• The first transformation series is the $3\mathrm{d}$ series.
• As a consequence, the $3\mathrm{d}$ array includes elements with atomic numbers ranging from $21\mathrm{to}30$.