The electronic configurations of 4 elements are:

①
②
③
④

Select the incorrect statement about these elements

Question

The electronic configurations of 4 elements are:

① 
② 
③ 
④

Select the incorrect statement about these elements

Canvas Classes · Accepted Answer

Strategy:
 Identify each element and check its classification/properties against the statements.

Step 1: Identification
- (1) : Rubidium (Group 1 Alkali metal).
- (2) : Lutetium (, f-block lanthanoid).
- (3) : Bromine (Group 17 Halogen).
- (4) : Cobalt (d-block transition metal).

Step 2: Evaluate Statements
- (a) (1) is alkali metal  strong reducing agent. (Correct)
- (b) (2) is Lutetium. Although it has a  electron, it is the final member of the f-block (lanthanoids). Classification as a d-bl

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