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Astatine is the rarest naturally-occurring element, with the total amount in Earth's crust estimated to be less than 1 oz (28 g) at any given time. This amounts to less than one teaspoon of the element. Guinness World Records has dubbed the element the rarest on Earth, stating: "Only around 0.9 oz (25 g) of the element astatine (At) occurring naturally". Isaac Asimov, in a 1957 essay on large numbers, scientific notation, and the size of the atom, wrote that in "all of North and South America to a depth of ten miles", the number of astatine atoms at any time is "only a trillion".

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βˆ™ 16y ago
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βˆ™ 5mo ago

The least common naturally occurring element in the universe is astatine, which is a highly radioactive element with a very short half-life. It is extremely rare on Earth and is usually only found in trace amounts in uranium ores.

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βˆ™ 13y ago

Sodium

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Q: What is the least common element in the universe?
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True or false that hydrogen is the least common element in the universe?

False. Hydrogen is the most abundant element in the universe, constituting about 75% of its elemental mass.


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The most common element in the universe is Hydrogen.


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What is the third most abundant element in the Sun?

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