Question

in which block of the periodic table is chromium (cr) found?
s block
d block
p block
f block

Explanation:

• The s - block elements have their outermost electrons in s - orbitals (groups 1 and 2).
• The p - block elements have their outermost electrons in p - orbitals (groups 13 - 18).
• The f - block elements (lanthanides and actinides) have their outermost electrons in f - orbitals.
• Chromium (\(Cr\)) has the electron configuration \([Ar]3d^{5}4s^{1}\). Since the last - filled subshell is the d - subshell, it belongs to the d - block. The d - block elements (groups 3 - 12) have their outermost electrons in d - orbitals.

Answer:

B. d block