Question:
The correct order of the metallic character of the elements Be, Al, Na, K is
The correct order of the metallic character of the elements Be, Al, Na, K is
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Metallic character increases down a group and decreases from left to right across a period.
Updated On: Jun 15, 2026
- \(K\gt Na\gt Al\gt Be\)
- \(K\gt Al\gt Na\gt Be\)
- \(Al\gt K\gt Na\gt Be\)
- \(Na\gt K\gt Be\gt Al\)
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The Correct Option is A
Solution and Explanation
Step 1: Recall the trend of metallic character.
Metallic character increases down a group because atomic size increases and ionization energy decreases.
Metallic character decreases from left to right across a period because effective nuclear charge increases.
Step 2: Compare potassium and sodium.
Potassium (\(K\)) lies below sodium (\(Na\)) in Group 1.
Since metallic character increases down the group,
\[ K\gt Na \]
Step 3: Compare sodium and aluminium.
Sodium (\(Na\)) and aluminium (\(Al\)) are in the same period.
Metallic character decreases from left to right across the period, therefore
\[ Na\gt Al \]
Step 4: Compare aluminium and beryllium.
Although both are metals, aluminium shows more metallic nature than beryllium because beryllium has small size and relatively higher ionization energy.
Thus,
\[ Al\gt Be \]
Step 5: Write the overall order.
Combining all comparisons,
\[ K\gt Na\gt Al\gt Be \]
Step 6: Final conclusion.
Hence, the correct order of metallic character is
\[ \boxed{K\gt Na\gt Al\gt Be} \]
Metallic character increases down a group because atomic size increases and ionization energy decreases.
Metallic character decreases from left to right across a period because effective nuclear charge increases.
Step 2: Compare potassium and sodium.
Potassium (\(K\)) lies below sodium (\(Na\)) in Group 1.
Since metallic character increases down the group,
\[ K\gt Na \]
Step 3: Compare sodium and aluminium.
Sodium (\(Na\)) and aluminium (\(Al\)) are in the same period.
Metallic character decreases from left to right across the period, therefore
\[ Na\gt Al \]
Step 4: Compare aluminium and beryllium.
Although both are metals, aluminium shows more metallic nature than beryllium because beryllium has small size and relatively higher ionization energy.
Thus,
\[ Al\gt Be \]
Step 5: Write the overall order.
Combining all comparisons,
\[ K\gt Na\gt Al\gt Be \]
Step 6: Final conclusion.
Hence, the correct order of metallic character is
\[ \boxed{K\gt Na\gt Al\gt Be} \]
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