Question

what are the fourth period elements called in periodic table​

Answer 1

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The period 4 transition metals are scandium (Sc), titanium (Ti), vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), and zinc (Zn).

Answer 2

The fourth-period elements are called transition elements.

• Transforming elements (also known as flexible metals) elements slightly complement the d orbitals. IUPAC defines the elements of change as an element with a small d shell that is slightly filled with electrons, or something that has the ability to form a stable cation with d orbital incomplete filling.
• Generally, any element associated with the d-block of the modern periodic table (consisting of groups 3-12) is considered a transformational element. Even f-block compounds comprising lanthanides and actinides can be considered transformational instruments.
• However, as the f-block elements partially fill the orbitals, they are often referred to as internal transition elements or internal change instruments.