Question

Identify the shell in which the last electron is filled in a d block element belongs to 5th period

Answer 1

Answer:

The period of an element corresponds to the principal quantum number of the Valence shell. The block of an element corresponds to the type of orbital which receive the last electron. For s-block elements , group number is equal to the number of valence electrons

Explanation:

Answer 2

The last electron will be filled in the 4d shell.

• The elements whose last electron gets filled in the 4d subshell are called d block elements
• The d block elements are also called transition metal elements.
• For the d block elements belonging to the 5th period, electrons will be added to the 4d orbital.
• Yttrium (atomic number 39) to cadmium (atomic number 48) belongs to 4d elements.
• Here the 4d orbitals are being filled successively.
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