There are total 10 groups in the d-block of the modern periodic table.

1.	There are total 10 groups in the d-block of the modern periodic table. Explain.
Answer» The d-block in the modem periodic table is formed as a result of filling the last electron in d orbital. As there are five orbitals in a d subshell, 10 electrons can successively be accommodated. Hence, there are total 10 groups in the d-block of the modem periodic table i.e., group 3 to 12.

There are total 10 groups in the d-block of the modern periodic table. Explain.

Answer»

The d-block in the modem periodic table is formed as a result of filling the last electron in d orbital.
As there are five orbitals in a d subshell, 10 electrons can successively be accommodated.

Hence, there are total 10 groups in the d-block of the modem periodic table i.e., group 3 to 12.