Question

Match the elements with the block they belong to in the modern periodic table.

• A. s-block
• B. p-block
• C. d-block
• D. f-block

Answer 1

Depending upon to which sub-shell the new coming electron (differentiating electron) enters, the elements are classified as ‘s’ ‘p’, ‘d’ and ‘f’ block elements.

Sodium is a s-block element as it gets its differentiating electron into 3s subshell.

Oxygen is a p-block element as it gets its differentiating electron into 2p subshell.

Iron is a d-block element as it gets its differentiating electron into 4d subshell.

Cerium is a f-block element as it gets its differentiating electron into 7f subshell.