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Why does ga have low Mpt than the rest of group 13
Accepted Answer
Gallium (Ga) has a significantly lower melting point (MP) than the other elements in Group 13 (B, Al, In, Tl) due to its weak metallic bonding. Here's why:
Weak Metallic Bonding: Gallium's metallic bonding is weaker compared to its heavier congeners (In and Tl) due to its relatively small atomic size and its filled d-orbitals. The d-orbitals in gallium don't effectively contribute to metallic bonding, leading to weaker interactions between the metal atoms.
Relatively Large Atomic Size: While gallium is smaller than the heavier group 13 elements, it's still larger than boron and aluminum. This larger atomic size weakens the metallic bonding by increasing the distance between the atoms.
These factors contribute to the unusually low melting point of gallium, which is surprisingly low for a metal.
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