Considering the elements B, Al, Mg and K, the correct order of their metallic character is:
Correct answer: D. K > Mg > Al > B
- A. B > Al > Mg > K
- B. Al > Mg > B > K
- C. Mg > Al > K > B
- D. K > Mg > Al > B
Explanation
The metallic character of elements generally increases as you move down a group in the periodic table because the atoms have more electron shells, making it easier to lose electrons. Conversely, metallic character decreases across a period from left to right due to increased nuclear charge, which holds the electrons more tightly. Among the elements given: potassium (K) is an alkali metal and is the most metallic, followed by magnesium (Mg) and aluminum (Al), which are both metals but less metallic than K. Boron (B) is a metalloid with the least metallic character in this group. Therefore, the correct order of increasing metallic character is K > Mg > Al > B.
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About Periodic Properties and Trends
Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
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