MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic ChemistryPeriodic PropertiesModern Periodic Table

An element with atomic number 21 is a

A.halogen

C.transition element✓ Correct

D.alkali metal

Explanation

The electronic configuration of an element with atomic number 21 is 2 2 6 2 6 2 1 1s 2s 2p 3s 3p 4s 3d and it is scandium. It is a d-block element as it enters into 3d series. And d-block elements are also known as transition elements.

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