MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic ChemistryPeriodic PropertiesModern Periodic Table
Which one of the following pair of elements has similar properties?
A.10, 12
B.11, 20
C.21, 33
D.13, 31✓ Correct
Explanation
The similarity of chemical properties of elements is due to the similar in outermost shell electronic configuration and the elements with similar outermost electronic configuration are classified as groups. Therefore, 2 2 6 2 1 Aluminum - 1s 2s 2p 3s 3p (Al) (z=13) and 10 2 1 Gallium - Ar 3d 4s 4p (Ga) (z=31) have similar properties. PERIODIC PROPERTIES 32
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