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From gaseous elements Helium is the 2nd lightest.

From solid elements Potassium is the 2nd lightest.

From liquid elements Mercury is the 2nd lightest AND heaviest.

(only two liquid elements: Bromium is the lightest)

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12y ago
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13y ago

The electron is considerably lighter than the proton, which is slightly lighter than the neutron. If that's all the candidates you were expecting, you can stop there; the answer is the proton.

Under the standard model, the gluon and photon are tied for lightest particle, since they both have zero mass (the graviton, if it exists, also has zero mass, making it a three-way tie). The lightest particle following that tie would probably be the up quark.

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14y ago

Helium is with a atomic weight of 4.002602 amu (Atomic Mass units)

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11y ago

Magnesium

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13y ago

helium

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14y ago

Lithium. Li

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3y ago

Helium

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Q: What is the second lightest chemical element?
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