The correct order of metallic character is:

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Strategy:
 Metallic character is defined by the ease of losing an electron. This property increases down a group (due to shell addition) and decreases across a period (due to increased nuclear charge).

Step 1: Compare Potassium (K) and Calcium (Ca)
- Both are in Period 4.  (Group 1) has a larger size and lower  than  (Group 2). Thus, .

Step 2: Compare Calcium (Ca) and Beryllium (Be)
- Both are in Group 2.  (Period 4) has more shells than  (Period 2), making its valence electron easier to remov

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