Question

Why is Mercury the only liquid metal, not Gallium also?​

Answer 1

Answer:

Basically, it's because mercury is bad at sharing—electrons, that is. Most metal atoms readily share valence electrons with other atoms. While mercury is the only liquid metal at room temperature, the elements gallium, cesium, and rubidium melt under slightly warmer conditions.

Explanation:

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Answer 2

Explanation:

Most metal atoms readily share valence electrons with other atoms. The electrons in a mercury atom are bound more tightly than usual to the nucleus. ... While mercury is the only liquid metal at room temperature, the elements gallium, cesium, and rubidium melt under slightly warmer conditions.